Exchange 2003 online defrag terminates ID 704 6am

I see the following logged at 6AM.   It resumes previoulsy failed at 1:15am as seen on 2nd log i pasted.  The public appears to run fine 2 or 3 times during that time but says only 3MB free space remaining.  

SBS 2003 SP2
Exchange 2003 has SP2 and 75GB set in the registry.  Currently PRIV has 40GB.

Event Type:      Information
Event Source:      ESE
Event Category:      Online Defragmentation
Event ID:      704
Date:            2/14/2010
Time:            6:00:00 AM
User:            N/ADescription:
Information Store (5020) First Storage Group: Online defragmentation of database 'D:\Exchange Data\mdbdata\priv1.edb' was interrupted and terminated. The next time online defragmentation is started on this database, it will resume from the point of interruption.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type:      Information
Event Source:      ESE
Event Category:      Online Defragmentation
Event ID:      702
Date:            2/14/2010
Time:            1:16:07 AM
User:            N/A
Description:
Information Store (5020) First Storage Group: Online defragmentation is resuming its pass on database 'D:\Exchange Data\mdbdata\priv1.edb'.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type:      Information
Event Source:      ESE
Event Category:      Online Defragmentation
Event ID:      701
Date:            2/14/2010
Time:            3:15:09 AM
User:            N/A
Description:
Information Store (5020) First Storage Group: Online defragmentation has completed a full pass on database 'C:\Program Files\Exchsrvr\mdbdata\pub1.edb'.

For more information, click http://www.microsoft.com/contentredirect.asp.

I've read a few MS articles and there is no NTBackup running or any exchange aware backup running on this particular day.

Thanks