Forum Discussion
Outlook - DesktopApp - Autoreply not working (server not available)
Although Microsoft says the problem has been fixed since version 2508 build 19127.20000 (please see Cannot open the Automatic Replies setting of a shared mailbox in Classic Outlook - Microsoft Suppor...
There is still a Outlook bug even though Microsoft says it was fixed, Though the autoreply error (“server not available”) still occurs, so the staying on the version 2505 (build 18827.20202) is currently the only reliable.