Hello, Why is there free space in a mailbox database, is the free space created when items are deleted ? Thanks

Its the logical space within a store that is available for Exchange to reuse when messages are deleted and purged from the database. Before 2010, Event 1221 in the app log would tell you how much free space was available.

On Tue, 4 Jan 2011 20:30:25 +0000, acmsoft wrote: >Why is there free space in a mailbox database, Because not all the space in the database is occupied by data. To be so efficient with data storage that there isn't any free space in a database would require extraordinary effort. The machine would spend more time uselessly shuffling data than it would in accomplishing the job it was supposed to be doing! >is the free space created when items are deleted ? That's one way. Another is when you add data and the file grows to accomdate that data. The file grows in increments larger than what's needed by a single message and the unused space is, well, free space. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Hi, And here is an article for you, Understanding Mailbox Database and Log Capacity Factors (look for Database white space section): http://technet.microsoft.com/en-us/library/ee832796.aspx Best regards, Serena Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.