Version: Microsoft Outlook 2013 Pro Plus
OS: Windows 8 Enterprise
Issue: Microsoft Exchange Add-in stays in "inactive" state, even after being re-enabled
Upgrade Status: PC upgraded from Windows 7; Office upgraded from 2010
End User Experience: Exchange UM voicemails do not have player form (shows as attachment); Meeting Room Finder missing from appointment form; Possibly more
Steps Taken: Attempted to enable add-in from COM Addin-ins dialog; Removed Office 2010; Repaired Office 2013; Deleted registry key "UmOutlookAddin.FormRegionAddin" from HKCU\Software\Microsoft\Office\15.0\Outlook\Addins; Rebooted;
Verified HKLM\SOFTWARE\Microsoft\Office\Outlook\Addins\UmOutlookAddin.FormRegionAddin was the same as on other PCs.
More information:
The Exchange add-in, which is installed with each version of Office, worked successfully on this PC for three months after Windows 8 / Office 2013 upgrade until it was noticed today it wasn't working. The Office 2010 version worked for two years prior
to that with no issues. This is connecting to an on-premises Exchange server. No other user is having this issue. No matter how many times I check the add-in box to enable it, it is inactive again on restarting Outlook. I cannot find
a way to force it to activate. No errors or crashes are being reported. Outlook is not in safe mode. All other add-ins, including the Lync 2013 add-in (another default add-in) are working.