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I currently have an in-house Exchange Server 2007 that is about to move to a hosted service of Exchange 2007/2010. I also have an in-house Office Communications Server (OCS) 2007. I know that OCS integrates with Exchange currently. I am wondering what will happen when I move Exchange outside of my network? Can in-house OCS 2007 be used (integrated) with a hosted Exchange service?

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As long as you setup autodiscover to hosted exchange, internal OCS works the same, albeit it asks for your password to hosted exchange on occasion. –  Royale Sep 29 '11 at 20:05

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