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Can large Exchange 2007 SP3 Enviorments <br />
use MS off premise mailbox servers and Outlook 365 or the cloud? 
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Can large Exchange 2007 SP3 Enviorments
use MS off premise mailbox servers and Outlook 365 or the cloud?

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You can use the online services (the cloud) together with whatever system you have in place. But you'll have to administer two separate systems.
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You can use the online services (the cloud) together with whatever system you have in place. But you'll have to administer two separate systems.

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Is that an AD &nbsp;connector issue?
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Do large enterprise Exchange 2007 SP3 enviorments really neeed to to upgrade to Exchange 2010 for any reason? &nbsp;Can they still use MS off premise mailbox servers and Outlook 365 or the cloud?
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Do large enterprise Exchange 2007 SP3 enviorments really neeed to to upgrade to Exchange 2010 for any reason?  Can they still use MS off premise mailbox servers and Outlook 365 or the cloud?

Question about the Exchange Cloud?

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.