Special message types for UC messages

My friend and fellow MVP Jim McBee just asked what item types OCS uses for creating items that end up in user mailboxes. There are actually several answers:

• For OCS conversations, you want IPM.Note.Microsoft.Conversation.
• Office Communicator Phone Edition devices use IPM.Note.Microsoft.Conversation.Voice for the call log entries they generate.
• Missed calls notifications are tagged with IPM.Note.Microsoft.Missed.Voice.

These are all easy to set from within Exchange Web Services code; just add a <t:ItemClass> block with the type you want to your CreateItemHeader object.