We are an Exchange 03 + Outlook 07 environment. The error, when user tried
to open Outlook program, was "Cannot open your default e-mail folders.
Microsoft Exchange is not available. Either there are network problems or
the Exchange computer is down for maintenance." Even though the user could
still access emails via OWA, it gaves me concerns because it's the 5th case
in past 2 months.
Re-creating a new Outlook profile, computer profile and Terminal server
profile has not fixed the issues. Basically, all we can do is get the user to switch to OWA.