Hello group! Last weekend I have made an inplace upgrade from SBS 2000 to SBS 2003. After a few hours, this upgrade completed without errors. Following the upgrade I applied all Windows 2003 updates. Still no problem... At last, I have applied Exchange SP 2 - again without errors. To verify the health of the server I have made a reboot. After a few minutes of "Applying computer settings" the harddisks finally stopped. I waited about 2 hours... All I could do is a hard reset and boot to safe mode. What I found out when in safe mode: - The event log showed no eventsregarding MSExchangeIS, nor any failed services - After setting the information store service to "disabled" in safe mode, the server reboots without errors - When started with disabledIS, the IS service can be started manually without errors To get rid of this behaviour, I have made a reinstall of Exchange with /disasterrecovery. Afterwards, everything was fine. But when re-applying Exchange SP 2 (without errors), this error comes up again. I would be glad of any help. My Google searches did not help me. Greetings from Germany! Robert Falk