How Can I Get All Users E-Mail ID's From 2008 R2 Active Directory ?

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Hello Friends ,

I Have One Doubt . How Can I Get All Users Company E-Mail ID's From 2008 R2 Active Directory ? Is There Any Option ?

For Example :

Domain Name : Google.Com
Username : Arjun

So The User Company E-Mail ID is " arjun@google.com "

There is Lot Of AD Users . So Is There Any Option To Download Or Copy Paste Option From AD Database....Anyone Knows About This Question ?

Thanks in Advance.......