Outlook2000 shared folers

Running outlook2000 on win2000 workstation, sharing calendar & contacts with 4 users same setup.Users have editor privlages.
Outlook on the user sharing the folders when going into properties in contact manager shared folders and hitting update users crashs outlook. (outlook.exe has caused application failure shutting down.)Still updates other users tho.And doing the same to calendar works fine. Now outlook periodically shuts down with that same error with left alone.Ran scanpst.exe and file checks out okay. Redid sharing and worked okay for awhile but back to same problem in a few days. Now is there a snyc problem (which i suspect) with the other users or is this a bug in outlook?