Q. Why isn't virtualization supported for the Exchange Server 2007 Unified Messaging (UM) server role?

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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