I have a small business server 2003 with sp1, and my users have been unable to connect to the exchange server for the last 48 hours. I investigated the problem and decided to restart the Exchange information store service. After restarting the service it is not stuck in a "Stopping" state and I cannot start or stop the service in this state.
The Event log is saying I have a number of exchange errors:
No database session was available to satisfy a request on database "First Storage Group\Mailbox Store (SBSERVER)".
The number of sessions configured via the Active Directory attribute msExchESEParamMaxSessions on the storage group may be set too low for the level of activity on this storage group.
The current value for this parameter is 149.
Logon Failure on database "First Storage Group\Mailbox Store (SBSERVER)" - Windows 2000 account PARAGON\barbara; mailbox /o=PARAGON/ou=first administrative group/cn=Recipients/cn=barbara.
This last error is repeated for a number of users.
I could restart the server but I would like to try and understand why this has happened now after 18 months of reasonable error free service.