Question : Exchange Server 2007 vs 2010 in regards with Unified Messaging and related PBXs

Hi there fellow experts,

Story:
I am undertaking the task of advising a corporation in regards with their Exchange Server and PBX infrastructure. I have already somewhat decided on the hardware of the server but i could use some advise on wether to go for the 2007 or the 2010 version (still in beta, i know...). Now i'm asking this because the corporation's management has decided to replace their current PBX as well.

Question:
Which PBX (it should be a voip enabled one) should they buy to get the most out of unified messaging and which Exchange Server version should be used to do that?

Thanks all in advance.
Ioannis Avgeros

Answer : Exchange Server 2007 vs 2010 in regards with Unified Messaging and related PBXs

Ideally, speaking Exchange 2007 along with its UM features works best with PBX boxes.

You may to read more about the following links about UM Implimentation
http://www.quintum.com/exchange-server/UM_configuration_notes.pdf

http://www.msexchange.org/articles_tutorials/exchange-server-2007/mobility-client-access/implementing-outlook-voice-access-exchange-server-2007-part2.html

http://blog.lithiumblue.com/2007/04/accessing-exchange-2007-unified_29.html

http://www.voip-news.com/feature/microsoft-pbx-strategy-011207/

Coming to your question of which PBX Box ....
Read what MS has to state.

http://technet.microsoft.com/en-us/library/cc164342.aspx

More over, try to wait until the release of E14 (Exchange server 2010) and check out its previews and feedback rather than jumping directly on buying it.

Secondly, with UM in place you can definitely get Office Communication Server - whch integrates with AD + Exchange + UM smoothly.