Specific Outlook clients are getting message that the server is offline when doing calendering functions or reply to all when the Outlook status in online.
I have 2 domains. Domain A is the forest root and B is a branch (not a child). The Exchange server is in A and serves the users in both domains. All of the sudden (meaning I am unaware of the change) Outlook clients in domain B who are on a seperate subnet, firewalled, but have complete IP access to Exchange and DCs on domain A (no port restrictions) are getting message stating "The conneciton is the MS Exchange server in unavailable. Outlook must be online or connected to complete this action." Those users are getting and sending emails fine (except reply to all function).
Having a tough time tracking this one down, any suggestions?