WMUtil is a small utility to allow users to compact and repair the Windows Mail database in Windows Vista.
The Windows Mail database periodically needs compacting and defragmenting to function with maximal performance. Currently there is no manual method to compact the database in Windows Mail, unless one tinkers with the values set at Tools | Options | Advanced | Maintenance. WMUtil allows the user to manually compact the database to remove any wasted space from it.
Occasionally the database becomes corrupted as indicated for example by the inability of being able to delete messages from various folders. The Windows Mail database has a built-in repair feature that can sometimes fix such problems. Windows Mail provides no access to this feature, so clicking on the Repair button will manually run the repair feature on the database. Clicking on the Clear Outbox button will remove references in the database to phantom outbox messages.
In addition a number of .eml and .nws files of zero byte length tend to accumulate in the message store, which can lead to a reduction in performance. The two buttons under the File Utilities allow the user to assess the number of messages and to remove the zero byte / blank messages.
Note: This program is free, but the author accepts and encourages donations towards further development.