However, because of a memory leak that the Mailbox Manager exposes, run the program only on servers running Exchange 5.5 SP2 or later. You can run the Mailbox Manager on one server within a site and have it process mailboxes on all the site's servers, so you don't have to upgrade every server to Exchange 5.5 SP2. Remember that running a program to process mailboxes on remote servers can generate a lot of network traffic, so you need to make a trade-off. I recommend that everyone upgrade to Exchange Server 5.5 because it's the best version of the software to date. Therefore, you must remove the Mailbox Cleanup Agent before installing the Mailbox Manager.
Installation is quick and easy.
After the installation is complete, you need to specify policies for the Mailbox Manager to enforce before you can set a schedule and start cleaning up your server. Setting Policies Microsoft describes the Mailbox Manager as a tool that helps enforce corporate message-retention policies. Every company is different and must factor its message-retention policy into the broader landscape of document and knowledge management. The message journaling feature that Exchange Server 5.5 SP2 introduced is another example of a document management extension for Exchange. You need to balance the need to protect confidential messages against the need to preserve important information.