According to the
Microsoft Knowledge Base Article 897614 - The following Windows Server System software is not supported within a Microsoft Virtual Server environment:
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Microsoft Speech Server - Speech Server requires telephony hardware not available in a virtualized hardware environment. Therefore, Speech Server is not supported when run within Virtual Server.
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Microsoft ISA Server 2000 - ISA Server 2000 is currently not supported running within Virtual Server.
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Microsoft ISA Server 2004 - ISA Server 2004 is currently not supported running within Virtual Server.
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Microsoft ISA Server 2006 - ISA Server 2006 is currently supported running within Microsoft Virtual Server 2005 R2.
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Microsoft SharePoint Portal Server - SharePoint Portal Server is currently not supported running within Virtual Server. Support for SharePoint Portal Server within Virtual Server is expected in a future release.
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Microsoft Identity Integration Server 2003 - Identity Integration Server 2003 is currently not supported running within Virtual Server.
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Microsoft Identity Integration Feature Pack - The Identity Integration Feature Pack is currently not supported running within Virtual Server.
According the the Network Load Balancing (NLB) support team, NLB is not supported within a Virtual Server image.