Question about the Exchange Cloud?

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?
355LT1Asked:
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mat_sullivanConnect With a Mentor Infrastructure EngineerCommented:
The reasons to upgrade are dependant on what you expect or need from your messaging system. But mainly will revolve around leveraging new features/functionality or maintaining support.

My company has just completed a move to MSFT hosted mail and we are ~60k users strong, so yes, larger enterprises are able to use hosted mail services.
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355LT1Author Commented:
Can large Exchange 2007 SP3 Enviorments
use MS off premise mailbox servers and Outlook 365 or the cloud?
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Sigurdur HaraldssonSystem AdministratorCommented:
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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355LT1Author Commented:
Is that an AD  connector issue?
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