A. Microsoft provides support for virtualizing all of Exchange 2007's roles except for UM, because UM uses a third-party Real Time Collaboration (RTC) stack. The vendor that made the stack doesn't support virtualization, so virtualizing UM would cause a support problem.

A number of companies have virtualized the UM role with no problems, but it's officially unsupported until the RTC vendor supports virtualization. UM running on early Hyper-V builds had voice quality problems but these have been resolved.

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