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Messaging Records Management (MRM) can be used to define polices for retention on specific folders.  You can also target an MRM policy to a specific group.  There is a 10 minute video that explains MRM on the Exchange Team Blog:

http://msexchangeteam.com/videos/9/general/entry442782.aspx

Essentially if you do not have any user mailboxes stores or public folder stores on an Exchange server that is operating as a front end server, then you can safely enable circular logging.  This will reduce the disk space requirements for the front end server. 

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Officially Microsoft does not support the storage of PST files on file shares whether they are on a LAN or WAN.  They have a knowledge base article specifically regarding this http://support.microsoft.com/kb/297019 but there is also a good commentary on the subject on the Microsoft Enterprise Platforms Windows Server Performance Team blog Network Stored PST files … don’t do it!

Erik Ashby, Edward Wu and Jenna Lyday give a live-meeting Webcast demonstrating the new Microsoft Transporter Suite for Lotus Domino.  They show how the suite can be used for migrating accounts, mailboxes and applications from Domino.

http://msexchangeteam.com/videos/9/tools/entry433052.aspx

Resources for Interoperability and Migration from Lotus Domino

Microsoft has a tool called the “Microsoft Transporter for Lotus Domino Availability” this tool claims to offer interoperability and migration from Lotus Domino to Active Directory, Exchange Server 2007, and Windows SharePoint Services 3.0.

http://www.microsoft.com/technet/interopmigration/collaboration/default.mspx