Hi, I have a client using Exch 03 on Srv 03. They have a Public Calendar that is shared across the organisation. If UserA creates a calendar entry in the public calendar and invites UserB, UserA will get an Undeliverable message fron the Sys Admin saying that UserC and UserD are not valid email addressed. UserC and UserD were disabled and deleted a long time ago (including all exchange attributes). I can't see where AD would be holding on to their info. Can anyone shed some light on this issue as it happens to people outside the organisation too (ExtUser1 sends invitation to UserA and gets undeliverable message from Sys Admin saying UserC and UserD don't esist)! Thanks. BWAY Support

Is there any forward or some rule from user b to user c and d? Jonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog

Hi, I suggest you check if you've set the delegate, see the following similar thread: http://social.technet.microsoft.com/forums/en-US/exchangesvrgeneral/thread/e064f8bf-7011-43e6-a871-685e966f47d6/ Thanks, Elvis