diff --git a/src/GitVersionCore.Tests/ConfigProviderTests.cs b/src/GitVersionCore.Tests/ConfigProviderTests.cs
index 3ae8e81d49..933aa2cd5d 100644
--- a/src/GitVersionCore.Tests/ConfigProviderTests.cs
+++ b/src/GitVersionCore.Tests/ConfigProviderTests.cs
@@ -42,34 +42,6 @@ public void Setup()
             ShouldlyConfiguration.ShouldMatchApprovedDefaults.LocateTestMethodUsingAttribute<TestAttribute>();
         }
 
-        [Test]
-        public void CanReadOldDocument()
-        {
-            const string text = @"
-assemblyVersioningScheme: MajorMinor
-develop-branch-tag: alpha
-release-branch-tag: rc
-branches:
-    master:
-        mode: ContinuousDeployment
-    dev(elop)?(ment)?$:
-        mode: ContinuousDeployment
-        tag: dev
-    release[/-]:
-       mode: continuousDeployment
-       tag: rc
-";
-            SetupConfigFileContent(text);
-            var error = Should.Throw<OldConfigurationException>(() => configProvider.Provide(repoPath));
-            error.Message.ShouldContainWithoutWhitespace(@"GitVersion configuration file contains old configuration, please fix the following errors:
-GitVersion branch configs no longer are keyed by regexes, update:
-    dev(elop)?(ment)?$  -> develop
-    release[/-]         -> release
-assemblyVersioningScheme has been replaced by assembly-versioning-scheme
-develop-branch-tag has been replaced by branch specific configuration.See https://gitversion.net/docs/configuration/#branch-configuration
-release-branch-tag has been replaced by branch specific configuration.See https://gitversion.net/docs/configuration/#branch-configuration");
-        }
-
         [Test]
         public void OverwritesDefaultsWithProvidedConfig()
         {
diff --git a/src/GitVersionCore.Tests/DefaultConfigFileLocatorTests.cs b/src/GitVersionCore.Tests/DefaultConfigFileLocatorTests.cs
index 83c7033d2a..55c6a9c73e 100644
--- a/src/GitVersionCore.Tests/DefaultConfigFileLocatorTests.cs
+++ b/src/GitVersionCore.Tests/DefaultConfigFileLocatorTests.cs
@@ -1,11 +1,9 @@
-using System;
 using System.IO;
 using NUnit.Framework;
 using Shouldly;
 using GitVersion.Configuration;
 using GitVersion.Exceptions;
 using GitVersion;
-using GitVersion.Logging;
 using GitVersionCore.Tests.Helpers;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
@@ -22,6 +20,7 @@ public class DefaultConfigFileLocatorTests : TestBase
         private string workingPath;
         private IFileSystem fileSystem;
         private IConfigProvider configurationProvider;
+        private IConfigFileLocator configFileLocator;
 
         [SetUp]
         public void Setup()
@@ -37,45 +36,12 @@ public void Setup()
 
             fileSystem = sp.GetService<IFileSystem>();
             configurationProvider = sp.GetService<IConfigProvider>();
+            configFileLocator = sp.GetService<IConfigFileLocator>();
 
             ShouldlyConfiguration.ShouldMatchApprovedDefaults.LocateTestMethodUsingAttribute<TestAttribute>();
         }
 
-        [TestCase(DefaultRepoPath)]
-        [TestCase(DefaultWorkingPath)]
-        public void WarnOnExistingGitVersionConfigYamlFile(string path)
-        {
-            SetupConfigFileContent(string.Empty, DefaultConfigFileLocator.ObsoleteFileName, path);
-
-            var output = WithDefaultConfigFileLocator(configFileLocator =>
-            {
-                configFileLocator.Verify(workingPath, repoPath);
-            });
-
-            var configFileDeprecatedWarning = $"{DefaultConfigFileLocator.ObsoleteFileName}' is deprecated, use '{DefaultConfigFileLocator.DefaultFileName}' instead";
-            output.Contains(configFileDeprecatedWarning).ShouldBe(true);
-        }
-
-        [TestCase(DefaultRepoPath)]
-        [TestCase(DefaultWorkingPath)]
-        public void WarnOnAmbiguousConfigFilesAtTheSameProjectRootDirectory(string path)
-        {
-            SetupConfigFileContent(string.Empty, DefaultConfigFileLocator.ObsoleteFileName, path);
-            SetupConfigFileContent(string.Empty, DefaultConfigFileLocator.DefaultFileName, path);
-
-            var output = WithDefaultConfigFileLocator(configFileLocator =>
-            {
-                configFileLocator.Verify(workingPath, repoPath);
-            });
-
-            var configFileDeprecatedWarning = $"Ambiguous config files at '{path}'";
-            output.Contains(configFileDeprecatedWarning).ShouldBe(true);
-        }
-
         [TestCase(DefaultConfigFileLocator.DefaultFileName, DefaultConfigFileLocator.DefaultFileName)]
-        [TestCase(DefaultConfigFileLocator.DefaultFileName, DefaultConfigFileLocator.ObsoleteFileName)]
-        [TestCase(DefaultConfigFileLocator.ObsoleteFileName, DefaultConfigFileLocator.DefaultFileName)]
-        [TestCase(DefaultConfigFileLocator.ObsoleteFileName, DefaultConfigFileLocator.ObsoleteFileName)]
         public void ThrowsExceptionOnAmbiguousConfigFileLocation(string repoConfigFile, string workingConfigFile)
         {
             var repositoryConfigFilePath = SetupConfigFileContent(string.Empty, repoConfigFile, repoPath);
@@ -83,10 +49,7 @@ public void ThrowsExceptionOnAmbiguousConfigFileLocation(string repoConfigFile,
 
             var exception = Should.Throw<WarningException>(() =>
             {
-                WithDefaultConfigFileLocator(configFileLocator =>
-                {
-                    configFileLocator.Verify(workingPath, repoPath);
-                });
+                configFileLocator.Verify(workingPath, repoPath);
             });
 
             var expecedMessage = $"Ambiguous config file selection from '{workingDirectoryConfigFilePath}' and '{repositoryConfigFilePath}'";
@@ -98,31 +61,7 @@ public void NoWarnOnGitVersionYmlFile()
         {
             SetupConfigFileContent(string.Empty, DefaultConfigFileLocator.DefaultFileName, repoPath);
 
-            var output = WithDefaultConfigFileLocator(configFileLocator =>
-            {
-                configurationProvider.Provide(repoPath);
-            });
-
-            output.Length.ShouldBe(0);
-        }
-
-        [Test]
-        public void WarnOnObsoleteIsDevelopBranchConfigurationSetting()
-        {
-            const string text = @"
-assembly-versioning-scheme: MajorMinorPatch
-branches:
-  master:
-    tag: beta
-    is-develop: true";
-
-            var exception = Should.Throw<OldConfigurationException>(() =>
-            {
-                LegacyConfigNotifier.Notify(new StringReader(text));
-            });
-
-            const string expectedMessage = "'is-develop' is deprecated, use 'tracks-release-branches' instead.";
-            exception.Message.ShouldContain(expectedMessage);
+            Should.NotThrow(() => { configurationProvider.Provide(repoPath); });
         }
 
         private string SetupConfigFileContent(string text, string fileName, string path)
@@ -132,19 +71,5 @@ private string SetupConfigFileContent(string text, string fileName, string path)
 
             return fullPath;
         }
-
-        private string WithDefaultConfigFileLocator(Action<IConfigFileLocator> action)
-        {
-            var stringLogger = string.Empty;
-            void Action(string info) => stringLogger = info;
-
-            var logAppender = new TestLogAppender(Action);
-            var log = new Log(logAppender);
-
-            var configFileLocator = new DefaultConfigFileLocator(fileSystem, log);
-            action(configFileLocator);
-
-            return stringLogger;
-        }
     }
 }
diff --git a/src/GitVersionCore.Tests/GitVersionExecutorTests.cs b/src/GitVersionCore.Tests/GitVersionExecutorTests.cs
index bb8972b9c4..947d7345c4 100644
--- a/src/GitVersionCore.Tests/GitVersionExecutorTests.cs
+++ b/src/GitVersionCore.Tests/GitVersionExecutorTests.cs
@@ -297,7 +297,7 @@ public void ConfigChangeInvalidatesCache()
             versionVariables = gitVersionCalculator.CalculateVersionVariables();
             versionVariables.AssemblySemVer.ShouldBe("4.10.3.0");
 
-            var configPath = Path.Combine(fixture.RepositoryPath, "GitVersionConfig.yaml");
+            var configPath = Path.Combine(fixture.RepositoryPath, DefaultConfigFileLocator.DefaultFileName);
             fileSystem.WriteAllText(configPath, "next-version: 5.0");
 
             versionVariables = gitVersionCalculator.CalculateVersionVariables();
diff --git a/src/GitVersionCore.Tests/Helpers/TestFileSystem.cs b/src/GitVersionCore.Tests/Helpers/TestFileSystem.cs
index 60196acd79..322bbe1e23 100644
--- a/src/GitVersionCore.Tests/Helpers/TestFileSystem.cs
+++ b/src/GitVersionCore.Tests/Helpers/TestFileSystem.cs
@@ -9,8 +9,7 @@ namespace GitVersionCore.Tests.Helpers
 {
     public class TestFileSystem : IFileSystem
     {
-        private static IEqualityComparer<string> fileSystemCasingComparer = System.Environment.OSVersion.Platform == PlatformID.Unix ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;
-        private readonly Dictionary<string, byte[]> fileSystem = new Dictionary<string, byte[]>(fileSystemCasingComparer);
+        private readonly Dictionary<string, byte[]> fileSystem = new Dictionary<string, byte[]>(StringComparerUtils.OsDependentComparer);
 
         public void Copy(string @from, string to, bool overwrite)
         {
@@ -122,7 +121,10 @@ public long GetLastDirectoryWrite(string path)
 
         public bool PathsEqual(string path, string otherPath)
         {
-            return path == otherPath;
+            return string.Equals(
+                Path.GetFullPath(path).TrimEnd('\\').TrimEnd('/'),
+                Path.GetFullPath(otherPath).TrimEnd('\\').TrimEnd('/'),
+                StringComparerUtils.OsDependentComparison);
         }
     }
 }
diff --git a/src/GitVersionCore.Tests/NamedConfigFileLocatorTests.cs b/src/GitVersionCore.Tests/NamedConfigFileLocatorTests.cs
index 21bbc291e9..f7199dd5e6 100644
--- a/src/GitVersionCore.Tests/NamedConfigFileLocatorTests.cs
+++ b/src/GitVersionCore.Tests/NamedConfigFileLocatorTests.cs
@@ -65,7 +65,6 @@ public void DoNotThrowWhenWorkingAndRepoPathsAreSame()
         }
 
         [Test]
-        [Platform(Exclude = "Linux,Unix")]
         public void DoNotThrowWhenWorkingAndRepoPathsAreSame_WithDifferentCasing()
         {
             workingPath = DefaultRepoPath.ToLower();
diff --git a/src/GitVersionCore/Configuration/ConfigFileLocator.cs b/src/GitVersionCore/Configuration/ConfigFileLocator.cs
index 45f54e6cd4..5a8a9296cd 100644
--- a/src/GitVersionCore/Configuration/ConfigFileLocator.cs
+++ b/src/GitVersionCore/Configuration/ConfigFileLocator.cs
@@ -1,18 +1,15 @@
 using System;
 using System.IO;
-using GitVersion.Logging;
 
 namespace GitVersion.Configuration
 {
     public abstract class ConfigFileLocator : IConfigFileLocator
     {
         protected readonly IFileSystem FileSystem;
-        protected readonly ILog Log;
 
-        protected ConfigFileLocator(IFileSystem fileSystem, ILog log)
+        protected ConfigFileLocator(IFileSystem fileSystem)
         {
             FileSystem = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
-            Log = log ?? throw new ArgumentNullException(nameof(log));
         }
 
         public abstract bool HasConfigFileAt(string workingDirectory);
@@ -26,12 +23,7 @@ public string SelectConfigFilePath(IGitPreparer gitPreparer)
             var workingDirectory = gitPreparer.GetWorkingDirectory();
             var projectRootDirectory = gitPreparer.GetProjectRootDirectory();
 
-            if (HasConfigFileAt(workingDirectory))
-            {
-                return GetConfigFilePath(workingDirectory);
-            }
-
-            return GetConfigFilePath(projectRootDirectory);
+            return GetConfigFilePath(HasConfigFileAt(workingDirectory) ? workingDirectory : projectRootDirectory);
         }
 
         public Config ReadConfig(string workingDirectory)
@@ -41,7 +33,6 @@ public Config ReadConfig(string workingDirectory)
             if (FileSystem.Exists(configFilePath))
             {
                 var readAllText = FileSystem.ReadAllText(configFilePath);
-                LegacyConfigNotifier.Notify(new StringReader(readAllText));
                 return ConfigSerializer.Read(new StringReader(readAllText));
             }
 
diff --git a/src/GitVersionCore/Configuration/ConfigFileLocatorFactory.cs b/src/GitVersionCore/Configuration/ConfigFileLocatorFactory.cs
index 8e4648fe3c..d76d1e4e74 100644
--- a/src/GitVersionCore/Configuration/ConfigFileLocatorFactory.cs
+++ b/src/GitVersionCore/Configuration/ConfigFileLocatorFactory.cs
@@ -1,5 +1,4 @@
 using System;
-using GitVersion.Logging;
 using Microsoft.Extensions.Options;
 
 namespace GitVersion.Configuration
@@ -7,21 +6,19 @@ namespace GitVersion.Configuration
     public class ConfigFileLocatorFactory : IConfigFileLocatorFactory
     {
         private readonly IFileSystem fileSystem;
-        private readonly ILog log;
         private readonly IOptions<Arguments> options;
 
-        public ConfigFileLocatorFactory(IFileSystem fileSystem, ILog log, IOptions<Arguments> options)
+        public ConfigFileLocatorFactory(IFileSystem fileSystem, IOptions<Arguments> options)
         {
             this.fileSystem = fileSystem ?? throw new ArgumentNullException(nameof(fileSystem));
-            this.log = log ?? throw new ArgumentNullException(nameof(log));
             this.options = options ?? throw new ArgumentNullException(nameof(options));
         }
 
         public IConfigFileLocator Create()
         {
             return string.IsNullOrWhiteSpace(options.Value.ConfigFile)
-                ? new DefaultConfigFileLocator(fileSystem, log) as IConfigFileLocator
-                : new NamedConfigFileLocator(fileSystem, log, options);
+                ? new DefaultConfigFileLocator(fileSystem) as IConfigFileLocator
+                : new NamedConfigFileLocator(fileSystem, options);
         }
     }
 }
diff --git a/src/GitVersionCore/Configuration/DefaultConfigFileLocator.cs b/src/GitVersionCore/Configuration/DefaultConfigFileLocator.cs
index 1ed2b93ca6..42b43f4af8 100644
--- a/src/GitVersionCore/Configuration/DefaultConfigFileLocator.cs
+++ b/src/GitVersionCore/Configuration/DefaultConfigFileLocator.cs
@@ -1,20 +1,16 @@
 using System.IO;
 using GitVersion.Exceptions;
-using GitVersion.Logging;
 
 namespace GitVersion.Configuration
 {
     public class DefaultConfigFileLocator : ConfigFileLocator
     {
-        public DefaultConfigFileLocator(IFileSystem fileSystem, ILog log) : base(fileSystem, log)
+        public DefaultConfigFileLocator(IFileSystem fileSystem) : base(fileSystem)
         {
-
         }
 
         public const string DefaultFileName = "GitVersion.yml";
 
-        public const string ObsoleteFileName = "GitVersionConfig.yaml";
-
         public override bool HasConfigFileAt(string workingDirectory)
         {
             var defaultConfigFilePath = Path.Combine(workingDirectory, DefaultFileName);
@@ -23,12 +19,6 @@ public override bool HasConfigFileAt(string workingDirectory)
                 return true;
             }
 
-            var deprecatedConfigFilePath = Path.Combine(workingDirectory, ObsoleteFileName);
-            if (FileSystem.Exists(deprecatedConfigFilePath))
-            {
-                return true;
-            }
-
             return false;
         }
 
@@ -40,12 +30,6 @@ public override string GetConfigFilePath(string workingDirectory)
                 return ymlPath;
             }
 
-            var deprecatedPath = Path.Combine(workingDirectory, ObsoleteFileName);
-            if (FileSystem.Exists(deprecatedPath))
-            {
-                return deprecatedPath;
-            }
-
             return ymlPath;
         }
 
@@ -53,13 +37,9 @@ public override void Verify(string workingDirectory, string projectRootDirectory
         {
             if (FileSystem.PathsEqual(workingDirectory, projectRootDirectory))
             {
-                WarnAboutObsoleteConfigFile(workingDirectory);
                 return;
             }
 
-            WarnAboutObsoleteConfigFile(workingDirectory);
-            WarnAboutObsoleteConfigFile(projectRootDirectory);
-
             WarnAboutAmbiguousConfigFileSelection(workingDirectory, projectRootDirectory);
         }
 
@@ -75,25 +55,5 @@ private void WarnAboutAmbiguousConfigFileSelection(string workingDirectory, stri
                 throw new WarningException($"Ambiguous config file selection from '{workingConfigFile}' and '{projectRootConfigFile}'");
             }
         }
-
-        private void WarnAboutObsoleteConfigFile(string workingDirectory)
-        {
-            var deprecatedConfigFilePath = Path.Combine(workingDirectory, ObsoleteFileName);
-            if (!FileSystem.Exists(deprecatedConfigFilePath))
-            {
-                return;
-            }
-
-            var defaultConfigFilePath = Path.Combine(workingDirectory, DefaultFileName);
-            if (FileSystem.Exists(defaultConfigFilePath))
-            {
-                Log.Warning(string.Format("Ambiguous config files at '{0}': '{1}' (deprecated) and '{2}'. Will be used '{2}'", workingDirectory, ObsoleteFileName, DefaultFileName));
-                return;
-            }
-
-            Log.Warning($"'{deprecatedConfigFilePath}' is deprecated, use '{DefaultFileName}' instead.");
-        }
-
     }
-
 }
diff --git a/src/GitVersionCore/Configuration/IConfigFileLocator.cs b/src/GitVersionCore/Configuration/IConfigFileLocator.cs
index 1eafec7143..4749d67da3 100644
--- a/src/GitVersionCore/Configuration/IConfigFileLocator.cs
+++ b/src/GitVersionCore/Configuration/IConfigFileLocator.cs
@@ -4,9 +4,9 @@ public interface IConfigFileLocator
     {
         bool HasConfigFileAt(string workingDirectory);
         string GetConfigFilePath(string workingDirectory);
+        void Verify(IGitPreparer gitPreparer);
         void Verify(string workingDirectory, string projectRootDirectory);
         string SelectConfigFilePath(IGitPreparer gitPreparer);
         Config ReadConfig(string workingDirectory);
-        void Verify(IGitPreparer gitPreparer);
     }
 }
diff --git a/src/GitVersionCore/Configuration/LegacyBranchConfig.cs b/src/GitVersionCore/Configuration/LegacyBranchConfig.cs
deleted file mode 100644
index 194aab5a9e..0000000000
--- a/src/GitVersionCore/Configuration/LegacyBranchConfig.cs
+++ /dev/null
@@ -1,16 +0,0 @@
-using YamlDotNet.Serialization;
-
-namespace GitVersion.Configuration
-{
-    /// <summary>
-    /// Obsolete properties are added to this, so we can check to see if they are used and provide good error messages for migration
-    /// </summary>
-    public class LegacyBranchConfig
-    {
-        [YamlMember(Alias = "is-develop")]
-        public string IsDevelop
-        {
-            get; set;
-        }
-    }
-}
diff --git a/src/GitVersionCore/Configuration/LegacyConfig.cs b/src/GitVersionCore/Configuration/LegacyConfig.cs
deleted file mode 100644
index 452293fd1d..0000000000
--- a/src/GitVersionCore/Configuration/LegacyConfig.cs
+++ /dev/null
@@ -1,56 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using YamlDotNet.Serialization;
-
-namespace GitVersion.Configuration
-{
-    /// <summary>
-    /// Obsolete properties are added to this, so we can check to see if they are used and provide good error messages for migration
-    /// </summary>
-    public class LegacyConfig
-    {
-        private readonly Dictionary<string, LegacyBranchConfig> branches = new Dictionary<string, LegacyBranchConfig>();
-
-        [YamlMember(Alias = "assemblyVersioningScheme")]
-        public string AssemblyVersioningScheme { get; set; }
-
-        [YamlMember(Alias = "develop-branch-tag")]
-        public string DevelopBranchTag { get; set; }
-
-        [YamlMember(Alias = "release-branch-tag")]
-        public string ReleaseBranchTag { get; set; }
-
-        [YamlMember(Alias = "branches")]
-        public Dictionary<string, LegacyBranchConfig> Branches
-        {
-            get => branches;
-            set
-            {
-                value.ToList().ForEach(_ =>
-                {
-                    if (!branches.ContainsKey(_.Key))
-                        branches.Add(_.Key, new LegacyBranchConfig());
-
-                    branches[_.Key] = MergeObjects(branches[_.Key], _.Value);
-                });
-            }
-        }
-
-        private T MergeObjects<T>(T target, T source)
-        {
-
-            var typeInfo = typeof(T);
-            typeInfo.GetProperties()
-                .Where(prop => prop.CanRead && prop.CanWrite)
-                .Select(_ => new
-                {
-                    prop = _,
-                    value = _.GetValue(source, null)
-                })
-                .Where(_ => _.value != null)
-                .ToList()
-                .ForEach(_ => _.prop.SetValue(target, _.value, null));
-            return target;
-        }
-    }
-}
diff --git a/src/GitVersionCore/Configuration/LegacyConfigNotifier.cs b/src/GitVersionCore/Configuration/LegacyConfigNotifier.cs
deleted file mode 100644
index e89b13afcc..0000000000
--- a/src/GitVersionCore/Configuration/LegacyConfigNotifier.cs
+++ /dev/null
@@ -1,63 +0,0 @@
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using YamlDotNet.Serialization;
-using YamlDotNet.Serialization.NamingConventions;
-
-namespace GitVersion.Configuration
-{
-    public class LegacyConfigNotifier
-    {
-        private static readonly Dictionary<string, string> OldConfigKnownRegexes = new Dictionary<string, string>
-        {
-            {Config.MasterBranchRegex, Config.MasterBranchKey},
-            {Config.DevelopBranchRegex, Config.DevelopBranchKey},
-            {Config.FeatureBranchRegex, Config.FeatureBranchKey},
-            {Config.HotfixBranchRegex, Config.HotfixBranchKey},
-            {Config.ReleaseBranchRegex, Config.ReleaseBranchKey},
-            {Config.SupportBranchRegex, Config.SupportBranchKey},
-            {Config.PullRequestRegex, Config.PullRequestBranchKey},
-            {"dev(elop)?(ment)?$", Config.DevelopBranchKey },
-            {"release[/-]", Config.ReleaseBranchKey },
-            {"hotfix[/-]", Config.HotfixBranchKey },
-            {"feature(s)?[/-]", Config.FeatureBranchKey },
-            {"feature[/-]", Config.FeatureBranchKey }
-        };
-
-        public static void Notify(StringReader reader)
-        {
-            var deserializer = new DeserializerBuilder().WithNamingConvention(NullNamingConvention.Instance).IgnoreUnmatchedProperties().Build();
-
-            var legacyConfig = deserializer.Deserialize<LegacyConfig>(reader);
-            if (legacyConfig == null)
-                return;
-
-            var issues = new List<string>();
-
-            var oldConfigs = legacyConfig.Branches.Keys.Where(k => OldConfigKnownRegexes.Keys.Contains(k) && k != OldConfigKnownRegexes[k]).ToList();
-            if (oldConfigs.Any())
-            {
-                var max = oldConfigs.Max(c => c.Length);
-                var oldBranchConfigs = oldConfigs.Select(c => $"{c.PadRight(max)} -> {OldConfigKnownRegexes[c]}");
-                var branchErrors = string.Join("\r\n    ", oldBranchConfigs);
-                issues.Add($@"GitVersion branch configs no longer are keyed by regexes, update:
-    {branchErrors}");
-            }
-
-            if (legacyConfig.AssemblyVersioningScheme != null)
-                issues.Add("assemblyVersioningScheme has been replaced by assembly-versioning-scheme");
-
-            if (legacyConfig.DevelopBranchTag != null)
-                issues.Add("develop-branch-tag has been replaced by branch specific configuration. See https://gitversion.net/docs/configuration/#branch-configuration");
-
-            if (legacyConfig.ReleaseBranchTag != null)
-                issues.Add("release-branch-tag has been replaced by branch specific configuration. See https://gitversion.net/docs/configuration/#branch-configuration");
-
-            if (legacyConfig.Branches != null && legacyConfig.Branches.Any(branches => branches.Value.IsDevelop != null))
-                issues.Add("'is-develop' is deprecated, use 'tracks-release-branches' instead. See https://gitversion.net/docs/configuration/#branch-configuration");
-
-            if (issues.Any())
-                throw new OldConfigurationException("GitVersion configuration file contains old configuration, please fix the following errors:\r\n" + string.Join("\r\n", issues));
-        }
-    }
-}
diff --git a/src/GitVersionCore/Configuration/NamedConfigFileLocator.cs b/src/GitVersionCore/Configuration/NamedConfigFileLocator.cs
index 09c994c502..4c330a653e 100644
--- a/src/GitVersionCore/Configuration/NamedConfigFileLocator.cs
+++ b/src/GitVersionCore/Configuration/NamedConfigFileLocator.cs
@@ -1,7 +1,6 @@
 using System;
 using System.IO;
 using GitVersion.Exceptions;
-using GitVersion.Logging;
 using Microsoft.Extensions.Options;
 
 namespace GitVersion.Configuration
@@ -10,7 +9,7 @@ public class NamedConfigFileLocator : ConfigFileLocator
     {
         private readonly IOptions<Arguments> options;
 
-        public NamedConfigFileLocator(IFileSystem fileSystem, ILog log, IOptions<Arguments> options) : base(fileSystem, log)
+        public NamedConfigFileLocator(IFileSystem fileSystem, IOptions<Arguments> options) : base(fileSystem)
         {
             this.options = options ?? throw new ArgumentNullException(nameof(options));
         }
@@ -36,10 +35,6 @@ private void WarnAboutAmbiguousConfigFileSelection(string workingDirectory, stri
             var workingConfigFile = GetConfigFilePath(workingDirectory);
             var projectRootConfigFile = GetConfigFilePath(projectRootDirectory);
 
-            var fileSystemCasingComparer = System.Environment.OSVersion.Platform == PlatformID.Unix ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
-            if (Path.GetFullPath(workingConfigFile).Equals(Path.GetFullPath(projectRootConfigFile), fileSystemCasingComparer))
-                return;
-
             var hasConfigInWorkingDirectory = FileSystem.Exists(workingConfigFile);
             var hasConfigInProjectRootDirectory = FileSystem.Exists(projectRootConfigFile);
             if (hasConfigInProjectRootDirectory && hasConfigInWorkingDirectory)
diff --git a/src/GitVersionCore/Helpers/StringComparerUtils.cs b/src/GitVersionCore/Helpers/StringComparerUtils.cs
index d454f1471c..e2b016a343 100644
--- a/src/GitVersionCore/Helpers/StringComparerUtils.cs
+++ b/src/GitVersionCore/Helpers/StringComparerUtils.cs
@@ -5,6 +5,7 @@ namespace GitVersion.Helpers
     public static class StringComparerUtils
     {
         public static readonly StringComparer IgnoreCaseComparer = StringComparer.InvariantCultureIgnoreCase;
-        public static readonly StringComparison OsDependentComparison = System.Environment.OSVersion.Platform == PlatformID.Unix ? StringComparison.InvariantCulture : StringComparison.InvariantCultureIgnoreCase;
+        public static readonly StringComparison OsDependentComparison = System.Environment.OSVersion.Platform == PlatformID.Unix ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
+        public static readonly StringComparer OsDependentComparer = System.Environment.OSVersion.Platform == PlatformID.Unix ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;
     }
 }