The Microsoft Exchange Server 5.5 Technical Library is your primary source for in-depth technical information on Exchange Server 5.5. The Exchange Server 5.5 Technical Library is a catalog of Exchange documentation that has been written and reviewed by the Microsoft Exchange product team. The documents on this Library page are designed to evolve over time, as new tricks, issues, and troubleshooting information become available. You will want to check this page periodically for document updates.