Mike Lagase wrote a great blog post on his blog talking about two issues (we have fixes for both) that can cause excessive paging on your Exchange 2007 servers. Those fixes are described in two KB articles:
I would definitely suggest that you go over to Mike’s blog and learn more about it, as he explains how to narrow those problems down and see if they are causing performance issues on your server!
Exchange Server 2007, Security Update, Paging, Mailbox
Source:→ Exchange Team Blog