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Office Communicator presence unknown.

I have a hosted exchange solution and have recently added OCS to it.  When I add contacts to OCS that are outside of my domain OCS shows them as 'Presence Unknown' and I cannot communicate with them.  The same contacts work fine with Windows Live Messenger.

Of course I have already contacted technical support for my hosting company, but they are of no help.  Is there something I have to change on my end?

Thanks
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gilget

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i thought OCS could do this out of the box?  guess i was mistaken.  thanks for the help.
yeah you was mistaken- OCS cant.

out of the box installation will only give you OCS functions within your own network.

since OCS is quiet a comprehensive and heavy application with lotsa features, your gona need to wisely plan your deployment.
OCS can interact with so many hardwaretypes and server functions, that you realy want to plan your structure, or you end up in a total mess, believe me.

here is the OCS deployment guide:

http://www.microsoft.com/Downloads/details.aspx?FamilyID=dcc3c69f-10ad-4537-9a66-b7de4cd1b56c&displaylang=en