Microsoft just released the latest version of Exchange 2010 Mailbox Server Role Requirements Calculator tool v 19.9 Several enhancements and bug fixes based on community feedback have been made. Enhancements Revised name of Offline Address Book in MailboxDatabases.csv file Integrated...

Version 17.8 Updates Bug Fixes Fixed the “Recommended databases per DAG” calculation formula to take into account symmetrical design multiples when the “Calculated Number of Databases for Symmetrical Distribution” is greater than the maximum of databases that can be deployed...

Use the information in this spreadsheet to determine the number of federation servers recommended for your Active Directory Federation Services (AD FS) 2.0 deployment. Download from here .