diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 79a43988dd..00a7af9ba8 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -3,9 +3,9 @@
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="11.0.0-beta.26421.2">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="11.0.0-beta.26456.1">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>51abc19095ae366ecb773826993966dc8a1063eb</Sha>
+      <Sha>66b75e61d883abd9e3af86a811c3809a8d9142ca</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/eng/common/Get-GitHubAppToken.ps1 b/eng/common/Get-GitHubAppToken.ps1
index 9c7e3dcd6a..ea776bd6bc 100644
--- a/eng/common/Get-GitHubAppToken.ps1
+++ b/eng/common/Get-GitHubAppToken.ps1
@@ -110,19 +110,20 @@ $headers = @{
 
 Write-Host "Looking up installation for '$InstallationOwner'..."
 try {
-    $installations = @()
+    $installations = [System.Collections.Generic.List[object]]::new()
     $page = 1
     do {
-        # Assign the response before wrapping it in @(). PowerShell otherwise
-        # preserves a top-level JSON array as one nested pipeline object.
         $pageResponse = Invoke-RestMethod `
             -Uri "https://api.github.com/app/installations?per_page=100&page=$page" `
             -Headers $headers `
             -Method Get
-        $pageInstallations = @($pageResponse)
-        $installations += $pageInstallations
+        $pageInstallationCount = 0
+        foreach ($installation in $pageResponse) {
+            $installations.Add($installation)
+            $pageInstallationCount++
+        }
         $page++
-    } while ($pageInstallations.Count -eq 100)
+    } while ($pageInstallationCount -eq 100)
 }
 catch {
     Write-PipelineTelemetryError -Category 'Build' -Message "Failed to list GitHub App installations: $_. The signed JWT may be invalid or the App's Client ID ('$AppClientId') may be incorrect."
diff --git a/eng/common/core-templates/job/helix-job-monitor.yml b/eng/common/core-templates/job/helix-job-monitor.yml
index 81ecccdd17..53bbf74927 100644
--- a/eng/common/core-templates/job/helix-job-monitor.yml
+++ b/eng/common/core-templates/job/helix-job-monitor.yml
@@ -62,6 +62,12 @@ parameters:
   type: number
   default: 30
 
+# Maximum number of work items whose results may be downloaded, parsed, and
+# uploaded concurrently.
+- name: testResultUploadParallelism
+  type: number
+  default: 48
+
 # When 'true' (the default), Helix work items that exit 0 but have failed AzDO test results
 # are treated as failed: they count toward the monitor's exit code and are resubmitted by a
 # later invocation's retry pass. Set to 'false' to fall back to exit-code-only outcomes.
@@ -215,6 +221,8 @@ jobs:
         --max-wait-minutes            "$((${{ parameters.timeoutInMinutes }} - 5))" # Set the tool's timeout slightly lower than the Azure DevOps job timeout to allow it to exit gracefully.
         --stage-name                  '$(System.StageName)'
         --stage-attempt               '$(System.StageAttempt)'
+        --job-attempt                 '$(System.JobAttempt)'
+        --test-result-upload-parallelism '${{ parameters.testResultUploadParallelism }}'
       )
 
       organization='${{ parameters.organization }}'
diff --git a/eng/common/core-templates/job/onelocbuild.yml b/eng/common/core-templates/job/onelocbuild.yml
index ce077368e4..e4e6b77fc3 100644
--- a/eng/common/core-templates/job/onelocbuild.yml
+++ b/eng/common/core-templates/job/onelocbuild.yml
@@ -9,9 +9,8 @@ parameters:
   GithubPat: $(BotAccount-dotnet-bot-repo-PAT)
 
   # Service connection for WIF-based Entra authentication to ceapex feeds (replaces CeapexPat).
-  # When set, dnceng/internal builds acquire a federated Entra token instead of using a PAT.
-  # All other projects (e.g. DevDiv, public), where this dnceng-scoped service connection does not
-  # exist, and any pipeline that sets this to '' fall back to PAT-based auth via the CeapexPat parameter.
+  # dnceng/internal and DevDiv/DevDiv have same-named, project-scoped connections. Other projects,
+  # and any pipeline that sets this to '', fall back to PAT-based auth via the CeapexPat parameter.
   CeapexServiceConnection: 'dnceng-onelocbuild-ceapex'
 
   # GitHub App authentication for the OneLoc check-in PR.
@@ -90,9 +89,8 @@ jobs:
         displayName: Generate LocProject.json
         condition: ${{ parameters.condition }}
 
-    # Acquire an Entra token for ceapex feed access via WIF (dnceng/internal only).
-    # All other projects use PAT-based auth, since the ceapex service connection is scoped to dnceng/internal.
-    - ${{ if and(ne(parameters.CeapexServiceConnection, ''), eq(variables['System.TeamProject'], 'internal')) }}:
+    # Acquire an Entra token for ceapex feed access in the supported internal and DevDiv projects.
+    - ${{ if and(ne(parameters.CeapexServiceConnection, ''), or(eq(variables['System.TeamProject'], 'internal'), eq(variables['System.TeamProject'], 'DevDiv'))) }}:
       - template: /eng/common/templates/steps/get-federated-access-token.yml
         parameters:
           federatedServiceConnection: ${{ parameters.CeapexServiceConnection }}
@@ -131,9 +129,9 @@ jobs:
           isUseLfLineEndingsSelected: ${{ parameters.UseLfLineEndings }}
           isShouldReusePrSelected: ${{ parameters.ReusePr }}
         packageSourceAuth: patAuth
-        ${{ if and(ne(parameters.CeapexServiceConnection, ''), eq(variables['System.TeamProject'], 'internal')) }}:
+        ${{ if and(ne(parameters.CeapexServiceConnection, ''), or(eq(variables['System.TeamProject'], 'internal'), eq(variables['System.TeamProject'], 'DevDiv'))) }}:
           patVariable: $(CeapexEntraToken)
-        ${{ if or(eq(parameters.CeapexServiceConnection, ''), ne(variables['System.TeamProject'], 'internal')) }}:
+        ${{ if or(eq(parameters.CeapexServiceConnection, ''), and(ne(variables['System.TeamProject'], 'internal'), ne(variables['System.TeamProject'], 'DevDiv'))) }}:
           patVariable: ${{ parameters.CeapexPat }}
         ${{ if eq(parameters.RepoType, 'gitHub') }}:
           repoType: ${{ parameters.RepoType }}
diff --git a/eng/common/core-templates/job/source-index-stage1.yml b/eng/common/core-templates/job/source-index-stage1.yml
index bac6ac5faa..b0dc8f1706 100644
--- a/eng/common/core-templates/job/source-index-stage1.yml
+++ b/eng/common/core-templates/job/source-index-stage1.yml
@@ -12,6 +12,7 @@ jobs:
 - job: SourceIndexStage1
   dependsOn: ${{ parameters.dependsOn }}
   condition: ${{ parameters.condition }}
+  continueOnError: true
   variables:
   - name: BinlogPath
     value: ${{ parameters.binlogPath }}
@@ -38,9 +39,11 @@ jobs:
 
   - ${{ each preStep in parameters.preSteps }}:
     - ${{ preStep }}
-  - script: ${{ parameters.sourceIndexBuildCommand }}
-    displayName: Build Repository
+  - ${{ if ne(parameters.sourceIndexBuildCommand, '') }}:
+    - script: ${{ parameters.sourceIndexBuildCommand }}
+      displayName: Build Repository
 
   - template: /eng/common/core-templates/steps/source-index-stage1-publish.yml
     parameters:
       binLogPath: ${{ parameters.binLogPath }}
+      runAsPublic: ${{ parameters.runAsPublic }}
diff --git a/eng/common/core-templates/steps/source-index-stage1-publish.yml b/eng/common/core-templates/steps/source-index-stage1-publish.yml
index fdca622357..6d4173aaf7 100644
--- a/eng/common/core-templates/steps/source-index-stage1-publish.yml
+++ b/eng/common/core-templates/steps/source-index-stage1-publish.yml
@@ -1,7 +1,9 @@
 parameters:
-  sourceIndexUploadPackageVersion: 2.0.0-20260521.2
-  sourceIndexProcessBinlogPackageVersion: 1.0.1-20260521.2
+  runAsPublic: false
+  sourceIndexUploadPackageVersion: '2.0.0-20260521.2'
+  sourceIndexComplogPackageVersion: '*'
   sourceIndexPackageSource: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
+  sourceIndexPublicPackageSource: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json
   binlogPath: artifacts/log/Debug/Build.binlog
 
 steps:
@@ -14,14 +16,17 @@ steps:
     workingDirectory: $(Agent.TempDirectory)
 
 - script: |
-    $(Agent.TempDirectory)/dotnet/dotnet tool install BinLogToSln --version ${{parameters.sourceIndexProcessBinlogPackageVersion}} --source ${{parameters.sourceIndexPackageSource}} --tool-path $(Agent.TempDirectory)/.source-index/tools
-    $(Agent.TempDirectory)/dotnet/dotnet tool install UploadIndexStage1 --version ${{parameters.sourceIndexUploadPackageVersion}} --source ${{parameters.sourceIndexPackageSource}} --tool-path $(Agent.TempDirectory)/.source-index/tools
-  displayName: "Source Index: Download netsourceindex Tools"
+    $(Agent.TempDirectory)/dotnet/dotnet tool install complog --version "${{parameters.sourceIndexComplogPackageVersion}}" --source ${{parameters.sourceIndexPublicPackageSource}} --tool-path $(Agent.TempDirectory)/.source-index/tools
+    $(Agent.TempDirectory)/dotnet/dotnet tool install UploadIndexStage1 --version "${{parameters.sourceIndexUploadPackageVersion}}" --source ${{parameters.sourceIndexPackageSource}} --tool-path $(Agent.TempDirectory)/.source-index/tools
+  displayName: "Source Index: Download Tools"
   # Set working directory to temp directory so 'dotnet' doesn't try to use global.json and use the repo's sdk.
   workingDirectory: $(Agent.TempDirectory)
 
-- script: $(Agent.TempDirectory)/.source-index/tools/BinLogToSln -i ${{parameters.BinlogPath}} -r $(System.DefaultWorkingDirectory) -n $(Build.Repository.Name) -o .source-index/stage1output
-  displayName: "Source Index: Process Binlog into indexable sln"
+- script: |
+    mkdir ".source-index/stage1output"
+    git rev-parse HEAD > .source-index/stage1output/hash
+    $(Agent.TempDirectory)/.source-index/tools/complog create ${{parameters.BinlogPath}} -o .source-index/stage1output/build.complog
+  displayName: "Source Index: Process Binlog into Complog"
 
 - ${{ if and(ne(parameters.runAsPublic, 'true'), ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
   - task: AzureCLI@2
diff --git a/eng/common/init-tools-native.sh b/eng/common/init-tools-native.sh
index 3e6a8d6acf..4de1a04fee 100755
--- a/eng/common/init-tools-native.sh
+++ b/eng/common/init-tools-native.sh
@@ -60,8 +60,8 @@ while (($# > 0)); do
       echo "                                          - (default) %USERPROFILE%/.netcoreeng/native"
       echo ""
       echo "  --clean                             Switch specifying not to install anything, but cleanup native asset folders"
-      echo "  --donotabortonfailure               Switch specifiying whether to abort native tools installation on failure"
-      echo "  --donotdisplaywarnings              Switch specifiying whether to display warnings during native tools installation on failure"
+      echo "  --donotabortonfailure               Switch specifying whether to abort native tools installation on failure"
+      echo "  --donotdisplaywarnings              Switch specifying whether to display warnings during native tools installation on failure"
       echo "  --force                             Clean and then install tools"
       echo "  --help                              Print help and exit"
       echo ""
@@ -83,7 +83,7 @@ function ReadGlobalJsonNativeTools {
     #   KEY="<entry-key>" VALUE="<entry-value>"
     # followed by a null byte.
     #
-    # bash: read line with null byte delimeter and push to array (for later `eval`uation).
+    # bash: read line with null byte delimiter and push to array (for later `eval`uation).
 
     while IFS= read -rd '' line; do
       native_assets+=("$line")
diff --git a/eng/common/loc/P22DotNetHtmlLocalization.lss b/eng/common/loc/P22DotNetHtmlLocalization.lss
index 5d892d6193..c810350e58 100644
--- a/eng/common/loc/P22DotNetHtmlLocalization.lss
+++ b/eng/common/loc/P22DotNetHtmlLocalization.lss
@@ -16,7 +16,7 @@
       <optionSet id="Espresso" displayName="Espresso"/>
       <optionSet id="Parsers" displayName="Parsers">
         <optionSet id="Parser 22" displayName="POMHTML Parser options" helpText="POMHTML Parser options for Localization Studio.">
-          <option id="SetCharsetInfo" displayName="Set or add Charset information when Generating" helpText="Add Charset information to the Generated file. This is in the format &lt;META HTTP-EQUIV=&quot;Content-Type&quot; CONTENT=&quot;text/html; charset=windows-1252&quot;&gt;. This is based on the Project Target Langauge. If the dir attribute value in the HTML tag i.e. &lt;HTML dir=&quot;ltr&quot;&gt; is not localizable or is missing, its value will be set automatically on Generate if the reading order of the target language is different from the source language.">
+          <option id="SetCharsetInfo" displayName="Set or add Charset information when Generating" helpText="Add Charset information to the Generated file. This is in the format &lt;META HTTP-EQUIV=&quot;Content-Type&quot; CONTENT=&quot;text/html; charset=windows-1252&quot;&gt;. This is based on the Project Target Language. If the dir attribute value in the HTML tag i.e. &lt;HTML dir=&quot;ltr&quot;&gt; is not localizable or is missing, its value will be set automatically on Generate if the reading order of the target language is different from the source language.">
             <boolean defaultValue="1" currentValue="0"/>
           </option>
           <option id="IncTermNoResId" displayName="Include Terms which have no Resource Identifier" helpText="Include Terms which have no Resource Identifier. Terms without Resource Identifiers cannot be Updated or Uploaded if they change.">
diff --git a/eng/common/post-build/nuget-verification.ps1 b/eng/common/post-build/nuget-verification.ps1
index eea88e653c..b51c49d106 100644
--- a/eng/common/post-build/nuget-verification.ps1
+++ b/eng/common/post-build/nuget-verification.ps1
@@ -17,10 +17,10 @@
     Arguments that will be passed to the verification tool.
 .EXAMPLE
     PS> .\verify.ps1 *.nupkg
-    Verifies the metadata of all .nupkg files in the currect working directory.
+    Verifies the metadata of all .nupkg files in the current working directory.
 .EXAMPLE
     PS> .\verify.ps1 --help
-    Displays the help text of the downloaded verifiction tool.
+    Displays the help text of the downloaded verification tool.
 .LINK
     https://github.com/NuGet/NuGetGallery/blob/master/src/VerifyMicrosoftPackage/README.md
 #>
diff --git a/eng/common/templates-official/variables/pool-providers.yml b/eng/common/templates-official/variables/pool-providers.yml
index 2cc3ae305d..9132110c4a 100644
--- a/eng/common/templates-official/variables/pool-providers.yml
+++ b/eng/common/templates-official/variables/pool-providers.yml
@@ -4,7 +4,7 @@
 # Motivation: 
 #   Once a given branch of a repository's output has been officially "shipped" once, it is then considered to be COGS
 #   (Cost of goods sold) and should be moved to a servicing pool provider. This allows both separation of queueing
-#   (allowing release builds and main PR builds to not intefere with each other) and billing (required for COGS.
+#   (allowing release builds and main PR builds to not interfere with each other) and billing (required for COGS.
 #   Additionally, the pool provider name itself may be subject to change when the .NET Core Engineering Services 
 #   team needs to move resources around and create new and potentially differently-named pools. Using this template 
 #   file from an Arcade-ified repo helps guard against both having to update one's release/* branches and renaming.
diff --git a/eng/common/templates/variables/pool-providers.yml b/eng/common/templates/variables/pool-providers.yml
index 587770f0ad..5ce1cbcf0e 100644
--- a/eng/common/templates/variables/pool-providers.yml
+++ b/eng/common/templates/variables/pool-providers.yml
@@ -4,7 +4,7 @@
 # Motivation:
 #   Once a given branch of a repository's output has been officially "shipped" once, it is then considered to be COGS
 #   (Cost of goods sold) and should be moved to a servicing pool provider. This allows both separation of queueing
-#   (allowing release builds and main PR builds to not intefere with each other) and billing (required for COGS.
+#   (allowing release builds and main PR builds to not interfere with each other) and billing (required for COGS.
 #   Additionally, the pool provider name itself may be subject to change when the .NET Core Engineering Services
 #   team needs to move resources around and create new and potentially differently-named pools. Using this template
 #   file from an Arcade-ified repo helps guard against both having to update one's release/* branches and renaming.
diff --git a/global.json b/global.json
index 653c9cd496..bac44313a9 100644
--- a/global.json
+++ b/global.json
@@ -1,14 +1,14 @@
 {
   "sdk": {
-    "version": "11.0.100-preview.6.26359.118",
+    "version": "11.0.100-rc.1.26420.103",
     "allowPrerelease": true,
     "rollForward": "major"
   },
   "tools": {
-    "dotnet": "11.0.100-preview.6.26359.118"
+    "dotnet": "11.0.100-rc.1.26420.103"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "11.0.0-beta.26421.2",
+    "Microsoft.DotNet.Arcade.Sdk": "11.0.0-beta.26456.1",
     "Microsoft.Build.NoTargets": "3.7.0",
     "Microsoft.Build.Traversal": "3.4.0"
   }