I'm having an issue with one user that is using 5.0.10 connector with outlook and the server is 5.0.10. We usually use the open other users mailbox to open a shared calendar. If we try to do that on their machine we get this error:

Zimbra Address Book Error

Failed to find Zimbra Global Address List in address book.

If I go to Tool/Address Book I do see the GAL. I don't get why they are getting this error. Anyone have any idea how to fix this problem?