We've made several bug fixes based on community feedback.
Please go to our Mailbox Server Role Storage Requirements Calculator updates tracking page to see what is in this new version!
A blog post explaining the calculator is here and or you can download the calculator directly.
Ross Smith IV Principal Program Manager Exchange Customer Experience
Read my favorites blogs:
Designing a backup less Exchange 2010 Architecture
Step by step guide for upgrading Active Directory from Microsoft Windows 2003 to Microsoft Windows Server 2008
Microsoft Exchange 2010 CAS Array – Steps and Recommendations
Appear Offline in Microsoft Office Communicator Server 2007
Microsoft Exchange 2010 Test cases
Microsoft Exchange Server 2010 Disaster Recovery