Can anyone please assist me with the problem happening today which occurs on multiple users in single AD domain:
Central office mailbox user has access to site office mailbox and sendas permission, suddenly it lost access to site office mailbox.
I checked and make sure:
1. All accounts are not locked.
2. All access permissions are in place.
I'm using Exchange 2010 SP3 and Outlook 2010 on all clients.
AD forest and domain level is Windows 2008R2.