Not quite sure what is happening... The server blue screened, and Exchange wouldn't mount when it came back up. Traced through the event log and tried to run a soft recovery, here is what it said - I've never seen this before. Any ideas?
Microsoft(R) Exchange Server Database Utilities
Copyright (C) Microsoft Corporation. All Rights Reserved.
Initiating RECOVERY mode...
Logfile base name: E00
Log files: C:\Program Files\Exchsrvr\MDBData
System files: <current directory>
Performing soft recovery...
Operation terminated with error -539 (JET_errDatabaseLogSetMismatch, Database does not belong with the current set of log files) after 5.0 seconds.