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I have an Exchange 2007 environment with 2 load balanced CAS servers (using NLB), 2 HT servers and for now, 2 MB servers. &nbsp;I want to introduce UM into the environment without adding more hardware. &nbsp;Which, if any specific, role is best to share and add UM on in this scenario? &nbsp;All of the hardware is very capable of handling the load. &nbsp;I wasn't sure if there are pros and cons of sharing certain roles on the same hardware of if NLB is helpful or harmful in this case.
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I have an Exchange 2007 environment with 2 load balanced CAS servers (using NLB), 2 HT servers and for now, 2 MB servers.  I want to introduce UM into the environment without adding more hardware.  Which, if any specific, role is best to share and add UM on in this scenario?  All of the hardware is very capable of handling the load.  I wasn't sure if there are pros and cons of sharing certain roles on the same hardware of if NLB is helpful or harmful in this case.

Exchange 2007 UM role shared with CAS, HT or MB?  Which is best?

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.