Exchange 2007 SP1 RU 9. We are in the midst of a large migration from Notes to Exchange. Big fat mailboxes. I have one EDB file that is growing in leaps and bounds and I can't figure out why. This is a database I had "filled" and stopped moving mailboxes to. Yesterday the EDB file was 203 gb. This morning it is suddenly 244 gb. Like I said, no new mailboxes have been moved to this database. We use MessageStats so I ran a report on the individual mailbox sizes for today and yesterday. This morning if you total up all the mailbox they are at around 191 gb. Check yesterday and it is also around 191 gb. It went up around 200 meg overnight, not 41 gb. Any ideas at all what might cause this? I am not looking forward to the cleanup either.

Have you done Full Normal back up your mailbox after the migration? What is oldest log files of your database shown in your log path?

This database hasn't had any mailboxes migrated into it in about a week I would say. But yesOn Saturday night / Sunday morning, yes. On Sunday Night / Monday morning, no. We outgrew the backup window we had set. We have expanded said window and are running a backup now. Just curious, but how would that affect the EDB file? We try and do a full backup every night.

Since migrated messages lost one instance storage, it's normal your individual mailbox size added up less than total DB size. Check event ID of 1221 to see what is free available space for the database after system done online defragmentation every morning to see if there any clue. BTW, your database is approaching Microsoft receommeded Exchange 2007 database size 200 GB per DB.

Again, no new mailboxes have been moved to this database in like a week. This wasn't caused by mailboxes being added to this database in any way because we haven't added any. This database EDB file was 203 GB, 191 GB of mailboxes, X amount of mailboxes. Now this database EDB file is 244 GB, 191 GB mailboxes, and still X amount of mailboxes. The number of mailboxes hasn't changed at all during this situation. Thanks

although mailbox number on the server is not increased, however, users are keep reciveing new emails. depends on settings of your DB, say, retention policy. users may delete msgs after they received and empty their deleted items folders, those msgs don't count their mailbox size quota, however, due to your retention policy, the those deleted msgs by users still in your DB and keep your DB growing...

Yes, I suppose it is possible that this group of users suddenly received 40+ gigs of mail in a single day on a holiday weekend and deleted it all in that same day. That would certainly explain it. Just hard to believe that is what happened.

Agree. have you checked event ID 1221 for yesterday and today? and what is the size of log files increased? Is there any application log that may explain the reason of ...?

The same issue was happend to one of my customer. I did offline defragmentation using eseutil.exe and after that the database size is reduced and problem solved. Now the database growth is normal. I don't know the root cause of this issue.