There are 1 entries for the tag defrag

Cleaning up whitespace in exchange

During the lifespan of an Exchange server a database can become very, very large in the size it takes on the disk, much larger than the space used by the mailboxes that reside in the database. This is because whilst mailbox sizes will expand and shrink according to their data usage, the Exchange database only expands. Any space freed up by deletes in mailboxes or even the removal of a mailbox all together become whitespace in the database file. In the worst case you could have 40 GB of mailboxes ......