I have to defrag the exchange store for quarterly maintenance. Problem is that the 1st storage group is 50gb, I only have 47GB free space on that drive. I've had all my users delete old mail. Looking at mailbox sizes after the clean up, they've collectively deleted 10GB. But the size of the store is still 50GB, it's not shrunk at all. Any ideas on why the size does not reflect the deletions?