EDIT 04/27/2009: We have updated the calculator to v16.9 to address a bug that was found.
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 (updated for this new version) is here. The download is here.
Comments welcome!
Updated Jul 01, 2019
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Microsoft
Joined April 19, 2019
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You Had Me at EHLO.