we've got some users where sporadically within the GroupWise client (Client Version 8 oder 2012 with and without caching mode, System is on GW 2012SP1) the error message 'GroupWise error 8200' - 'Cannot access post office files' pops-up. Recreating a new GW-Database, Re-Installing a new client, GWCheck, checking the network does not help.

Did someone have a suggestion, idea for this problem?