5.0.11 The Zimbra Addin has experienced a serious error. Try restarting Outlook again

[centrex]

When upgrading from 5.0.9 to 5.0.10, some users got an error message

The Zimbra Addin has experienced a serious error. Try restarting Outlook again.

Those were users who also had certain items not sync in the past, getting "Local Failure Notices".

I think this may have been in relation to Bug 32309.

Today, server and the affected clients were upgraded to 5.0.11 but the issue still exists!

[quietas]

I've been seeing this with one user in particular. I recreated his account in Outlook 2003 and it's still having issues. Others with Zimbra connecter are working fine.