If you are considering Exchange 2010 for archiving, be aware of two factors that can increase the cost of, and delay, implementation:
- The archiving features of Exchange 2010 require enterprise CALs. If you are not already using enterprise CALs, then you must pay the additional cost to upgrade.
- To use Exchange 2010 archiving, you must also upgrade to Office 2010. This will ship six to nine months AFTER Exchange 2010 ships. This will add a significant cost to an organization that has Office 2007 deployed and does not wish to upgrade all of its desktop machines. Without Office 2010, you can’t leverage the archive functionality.

One Comment
So what you’re saying is that if you are an early adopter of Exchange 2010, you won’t be able to archive for six months?
I love it when Microsoft announces products they aren’t really ready to ship yet. They help drive interest in that sector and traffic towards companies than can already provide cost effective platform independent equivalents.
Timothy,
Unless you have access to Office 2010 your question is correct. You can find some more information here:
http://blogs.technet.com/haroldwong/archive/2009/06/19/exchange-server-2010-archiving-and-retention-06-10-09-questions-and-answers-log.aspx
You can use the archiving features of Exchange 2010 with Office 2010 beta if you’re desperate. Been using it myself for a month without issues.