A FREE tool from Quest – Migration Assessment Tool, that help any Exchange guy in migration scenarios or to get an inventory of the Exchange infrastructure.

This free, browser-based application provides expert guidance for evaluating Exchange Online, Google Gmail, and Exchange 2010 as your next messaging solution. Optionally collect information from your existing Exchange 2003 / 2007 mail system to get:

• A customized feature comparison for each mail system
• A current inventory of Exchange 2003 / 2007 servers, mailboxes, public folders and mobile devices

Access the tool here