Awesome Exchange news!
Finally the feedback has been implemented.
http://www.microsoft.com/exchange/downloads/2003/sp2/faq.mspx

The great news here is that the much loathed 16gb limit in Exchange Standard edition (as well as Small Business Server) has finally been lifted. Standard edition will still be limited to 1 Mailbox Store, but the new limit will be 75gb. This will be awesome news to those customers that aren't big enough to need Enterprise edition, but are still running into issues with the 16gb limit. The upgrade is supposed to be painless. Once you install SP2, the store should automatically be upgraded.
- posted by Ben Winzenz @ 10:21 AM