This past Monday Ross Smith from Microsoft Exchange Team, posted the Exchange 2010 Mailbox Server Role Requirements Calculator during one of his sessions at the Exchange Connections conference in Las Vegas. This tool is the equivalent of the Exchange 2007 Storage Calculator. It’s actually a giant Excel spreadsheet. It’s a useful tool to assist in sizing your Exchange servers and storage. There are many assumptions made when using this calculator, so you always want to test, pilot, and deploy in phases to production. I’ll be posting some of my Best Practices in another blog soon.