Record Microsoft's in-app notice for personal accounts

docs/retirement/README.md

@@ -27,13 +27,25 @@ and Android retire on **October 16, 2026**." It also states that after that date
 Whiteboard gallery". October 16 is also the date remaining Azure-based boards are
 permanently deleted.
 
+**September 27, 2026:** the Windows app itself, signed in with a personal Microsoft
+account, shows a banner above the board (see
+[Microsoft Whiteboard in-app notice (personal account).png](<Microsoft Whiteboard in-app notice (personal account).png>)):
+"Microsoft Whiteboard for Microsoft account is being retired. Starting from September
+25, 2026, you will no longer be able to create or edit whiteboards. Please export any
+whiteboards you’d like to keep before October 16, 2026, after which they will be
+permanently deleted." This is the only place Microsoft states the September 25 edit
+freeze and the deletion of personal-account boards; the support pages describe the
+retirement of the apps and the deletion of Azure-based work and school boards.
+
 ## Citing the retirement publicly
 
 - Always scope the claim to the standalone **app**: Whiteboard itself remains available
   in Teams and on the web.
 - Say the app **"retires"** on October 16 — and, quoting Microsoft, that installed apps
-  then display "a retirement experience instead of opening". Both are verbatim claims;
-  do not paraphrase beyond them.
+  then display "a retirement experience instead of opening". For personal accounts, the
+  in-app notice adds that boards "will be permanently deleted" after October 16 and that
+  editing ended on September 25. All of these are verbatim claims; do not paraphrase
+  beyond them.
 - Quote with a screenshot, and prefer an archived copy or the bitmap over the live
   pages, because the schedule changed three times in the ten days around our launch, and may
   change again. Snapshot each revision to the Wayback Machine when it changes.

site/export-microsoft-whiteboard.html

@@ -49,7 +49,7 @@ <h1>Export your boards from Microsoft Whiteboard</h1>
     <h2>What changes on 16 October</h2>
     <p>The standalone Microsoft Whiteboard apps for Windows, iOS, and Android retire on 16 October 2026.</p>
     <ul>
-      <li>With a personal Microsoft account, installed apps then display “a retirement experience instead of opening the Whiteboard gallery or whiteboard content”, <a href="https://support.microsoft.com/en-us/whiteboard/retirement-standalone-microsoft-whiteboard-apps">according to Microsoft</a>. Export your boards before 16 October.</li>
+      <li>With a personal Microsoft account, the app has shown this notice since 25 September: “you will no longer be able to create or edit whiteboards. Please export any whiteboards you’d like to keep before October 16, 2026, after which they will be permanently deleted.” Installed apps then display “a retirement experience instead of opening the Whiteboard gallery or whiteboard content”, <a href="https://support.microsoft.com/en-us/whiteboard/retirement-standalone-microsoft-whiteboard-apps">according to Microsoft</a>. Export your boards before 16 October.</li>
       <li>With a work or school account, boards stored in OneDrive stay available in Whiteboard in Teams and on the web. Boards still stored in Azure are deleted on 16 October.</li>
     </ul>