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the most important thing is backup. if you have a good backup then the data can be restored.
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the most important thing is backup. if you have a good backup then the data can be restored.

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If the Exchange server is crashed, is there any way to get back the mails and contacts back? <br />
What are the precautions we can take for this problem? 
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If the Exchange server is crashed, is there any way to get back the mails and contacts back? 
What are the precautions we can take for this problem? 

Exchange server

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.