diff --git a/PortaAssist-Mac.xml b/PortaAssist-Mac.xml
index d6f2c3f..99e8c1d 100644
--- a/PortaAssist-Mac.xml
+++ b/PortaAssist-Mac.xml
@@ -2,7 +2,9 @@
 <!--
   Add-in-only manifest (not Unified): Outlook on Mac does not load the unified
   JSON manifest. SourceLocation is Nyla /assist-pane/ — UI updates are a deploy.
-  Version follows Directory.Build.props; bump only when Hosts or permissions change.
+  Office <Version> must be >= 1.0 and four-part (n.n.n.n). It is not the
+  product line in Dist README (0.6.x). A value like 0.6.25 fails Excel
+  Online and is ignored on Mac desktop: "Manifest Version Too Low".
 
   DialogApi 1.1: displayDialogAsync + messageParent. Documented as supported on
   Office for Mac (Word/Excel/PowerPoint/Outlook) — Microsoft Learn, Common API
@@ -15,7 +17,7 @@
   xmlns:ov="http://schemas.microsoft.com/office/taskpaneappversionoverrides"
   xsi:type="TaskPaneApp">
   <Id>8f3c2e1a-6b4d-4a19-9c7e-2d1f0a8b5c34</Id>
-  <Version>0.6.25</Version>
+  <Version>1.0.26.0</Version>
   <ProviderName>PowerOn AG</ProviderName>
   <DefaultLocale>de-CH</DefaultLocale>
   <DisplayName DefaultValue="PORTA Assist" />
diff --git a/README.md b/README.md
index 879915e..7e09bc4 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Das muss zur Setup-Datei passen (nicht die Windows-Bitness).
 |-------|--------|
 | `PortaAssist-Setup-x64.exe` | `DEEC72134C48276B21BEF54CCA5AB4D0466FB18DFE82FCB5ED35ECE718F948B9` |
 | `PortaAssist-Setup-x86.exe` | `3F2E236E779D5D4A9E30435FDA8E8C8FE4E8A0C3B6226B0BC432107C462CEB2F` |
-| `PortaAssist-Mac.xml` | `6c7897af58f245b2486365152e2364eb549dadf78f988aa6202fd455bcefb29d` |
+| `PortaAssist-Mac.xml` | `1a7baa169f81f556b2209ad89c52705f0ddf83490c64940dc9a268820459730d` |
 
 ## Hinweise
 
diff --git a/archive/PortaAssist-Mac-0.6.26.xml b/archive/PortaAssist-Mac-0.6.26.xml
index d6f2c3f..99e8c1d 100644
--- a/archive/PortaAssist-Mac-0.6.26.xml
+++ b/archive/PortaAssist-Mac-0.6.26.xml
@@ -2,7 +2,9 @@
 <!--
   Add-in-only manifest (not Unified): Outlook on Mac does not load the unified
   JSON manifest. SourceLocation is Nyla /assist-pane/ — UI updates are a deploy.
-  Version follows Directory.Build.props; bump only when Hosts or permissions change.
+  Office <Version> must be >= 1.0 and four-part (n.n.n.n). It is not the
+  product line in Dist README (0.6.x). A value like 0.6.25 fails Excel
+  Online and is ignored on Mac desktop: "Manifest Version Too Low".
 
   DialogApi 1.1: displayDialogAsync + messageParent. Documented as supported on
   Office for Mac (Word/Excel/PowerPoint/Outlook) — Microsoft Learn, Common API
@@ -15,7 +17,7 @@
   xmlns:ov="http://schemas.microsoft.com/office/taskpaneappversionoverrides"
   xsi:type="TaskPaneApp">
   <Id>8f3c2e1a-6b4d-4a19-9c7e-2d1f0a8b5c34</Id>
-  <Version>0.6.25</Version>
+  <Version>1.0.26.0</Version>
   <ProviderName>PowerOn AG</ProviderName>
   <DefaultLocale>de-CH</DefaultLocale>
   <DisplayName DefaultValue="PORTA Assist" />
diff --git a/index.html b/index.html
index ee9c502..bee7124 100644
--- a/index.html
+++ b/index.html
@@ -209,7 +209,7 @@
       </div>
       <div style="margin-top:0.75rem">
         <div>Mac Manifest</div>
-        <code>6c7897af58f245b2486365152e2364eb549dadf78f988aa6202fd455bcefb29d</code>
+        <code>1a7baa169f81f556b2209ad89c52705f0ddf83490c64940dc9a268820459730d</code>
       </div>
     </div>