The Expire/Reduce Messages option of Mailbox/Library Maintenance eliminates expired messages and reclaims any free space in the database. You can expire/reduce messages for one or more users or resources, or for all users and resources in one or more post offices. You should inform users before you run this process so they have a chance to archive or delete messages.
In ConsoleOne, browse to and select one or more User or Resource objects to expire/reduce messages for the selected users and resources.
or
Browse to and select one or more Post Office objects to expire/reduce messages for all users and resources in each selected post office.
Click Tools > GroupWise Utilities > Mailbox/Library Maintenance.

From the Action drop-down menu, select Expire/Reduce Messages.
Click Reduce Only to delete items that have already expired.
or
Click Expire and Reduce.
Expire and Reduce: Select one or more of the following:
Age Limit: Expire messages that are older than the number of days you specify.
Size Limit: This option is available only if you deselect the age limit options. It will expire messages that are larger than the size you specify.
Reduce to: This option is available only if you deselect the age limit options. Beginning with the oldest, it will expire messages until the user database is reduced to the size you specify.
In the Include box, select Received Items, Sent Items, Calendar Items, and/or Only Backed-Up Items. You might want to notify users of the types of items that will be deleted.
Using the tabs at the bottom of the Mailbox/Library Maintenance dialog box, set the following options:
Selected options can be saved for repeated use. See Saving Mailbox/Library Maintenance Options.
Click Run to perform the Expire/Reduce Messages operation.
For additional disk space management assistance, see Managing Disk Space Usage in the Post Office.