Google Message Archiving Microsoft Exchange Journaling Configuration Guide For Exchange Server 2000 and 2003 - Manual (Page 33)

Setting Up Microsoft Exchange Journaling 37
To schedule Mailbox Manager to run policies:
1. Open Exchange System Manager and locate the server that is hosting
mailarchive .
2. Right-click the server, and then click Properties.
3. In the server Properties dialog box, click the Mailbox Management tab.
4. In the Start mailbox management process drop-down list, select a schedule
appropriate for your organization. For example:
5. Click OK.