<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hi Everyone,</div><div><br data-mce-bogus="1"></div><div>I installed Zimbra patch 10.1.17 this evening on a Zimbra cluster. The patch appeared to install successfully and services restarted fine, however I did encounter a possible bug with ZCO build 1951, that is included with patch 10.1.17 and wanted to post a cautionary note here as a heads-up, so you can verify if this is an issue in your environment too. I'm re-posting this on the Zimbra Forum too.</div><div><br data-mce-bogus="1"></div><div>I opened Outlook 365 Classic on a Windows 10 test machine that has an existing Zimbra profile running ZCO 1950. The Zimbra mailbox for this Outlook profile has 2FA enabled. After entering the 2FA code, Outlook opens and it correctly prompts to upgrade to ZCO 1951. After allowing it to upgrade to build 1951, the installer exits, and Outlook Classic automatically restarts, and the Outlook splash screen appears. However, instead of displaying the expected 2FA prompt, Outlook appears to crash as the Outlook splash screen disappears & there is no longer any outlook.exe process running. I also did an uninstall of ZCO 1951, then manually re-installed it from <a href="https://www.zimbra.com/product/addons/zimbra-connector-for-outlook-download/">https://www.zimbra.com/product/addons/zimbra-connector-for-outlook-download/</a> and received the same result. Uninstalling ZCO 1951 and rolling back to ZCO 1950 fixes the issue, allowing Outlook to again correctly prompt for the 2FA code and launching successfully. I made no changes to the Outlook profile while testing.</div><div><br data-mce-bogus="1"></div><div>In the event this is later confirmed to be a bug in ZCO 1951, I rolled back to ZCO 1950 on the server-side (<a href="https://wiki.zimbra.com/wiki/Zmupdatedownload">https://wiki.zimbra.com/wiki/Zmupdatedownload</a>) to prevent all hell from breaking loose when users start-up their Outlook apps on Monday morning & would otherwise begin upgrading to 1951.</div><div><br></div><div data-marker="__SIG_PRE__"><div><div><div><span style="color:rgb( 255 , 102 , 0 );font-weight:bold"><br>Randy Leiker (</span><span style="font-weight:bold"> <span style="color:rgb( 51 , 51 , 255 );background-color:rgb( 255 , 255 , 255 )">randy@skywaynetworks.com</span> <span style="color:rgb( 255 , 102 , 0 )">)</span></span><br><span style="color:rgb( 0 , 0 , 153 )">Skyway Networks, LLC</span><br><br></div></div></div></div></div></body></html>