2.2.2.1 Message Classes

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For voice messages, the value of the PidTagMessageClass property ([MS-OXOMSG] section 2.2.2.1) MUST be one the following:

  • IPM.Note.Microsoft.Voicemail.UM.CA for original messages taken with audio content by telephone.

  • IPM.Note.Microsoft.Voicemail.UM for original messages taken with audio content by telephone but not as a result of call answering (for example, if the phone of the recipient did not ring).

  • The value of the original PidTagMessageClass property suffixed with .Microsoft.Voicemail for messages with audio content that was created in response to other messages. For example, a voice reply to a message of type IPM.Note has the type IPM.Note.Microsoft.Voicemail.

For fax messages, the value of the PidTagMessageClass property MUST be set to IPM.Note.Microsoft.FAX.CA.

For missed call notifications, the value of the PidTagMessageClass property MUST be set to IPM.Note.Microsoft.Missed.Voice.