MBXMAINT now comes as two versions: MBXMAINT.EXE is a commandline utility that can be used in scripts, while MBXMAINT_UI is the traditional GUI version of the application. Both have also been slightly improved in the types of error conditions they can handle.
This tool can be used on mail folders in Pegasus or Mercury/32 for checking a folder, compressing it, or repair it if it is damaged. Enter mbxmaint in a command window to see all options for the command line version.
Always make sure to have a backup of important data before compressing or repairing.
MBXMAINT is included in the standard installation of Pegasus.
[Updated February 2011]