Recently Microsoft Exchange team released the updated version of Exchange Mailbox Server Requirements Calculator, which can be downloaded from here.
This new enhanced version of Mailbox Role Calculator includes series of bugs fixed from the earlier version.
It is recommended to use it before you size your Exchange implementation.
Thanks for sharing this helpful resource. There are also some third party applications which help to repair and recover the damaged Exchange database file and the recovered database can be mount directly on the server like http://www.edbtopst-converter.com I read that it supports all versions of MS Exchange server and provides two options. User can save the recovered database file either into .edb OR can export Exchange mailboxes in individual .pst files(which can be imported into MS Outlook).
You can use this tool, it may help you to recover corrupted exchange databaes. http://exchange.stellarservertools.com/
Checkout one of the best Exchange Server EDB Recovery software, which i ever used :
http://www.edbtopst-converter.com
Thanks
Azure Hybrid & Cloud Migration Blog 
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