You’re interested in possible Client Capabilities of Messenger 2010? Take a look at this summary of the current dogfood build 2583.
3056373808:2088848 Decimal
B62C9030:1FDF90 Hexadecimal
B....... CapabilityMsgrVersion11: Supports MSNC11 (WL Msgr 15.2)
.4...... CapabilityP2PBootstrapViaUUN
.2...... CapabilityP2PSupportsTurn
..2..... CapabilitySupportsTunneledSip
...8.... CapabilitySupportsSChannel
...4.... CapabilitySupportsVoiceIM
...1.... CapabilitySupportsMSNSearch
....8... CapabilitySupportsWinks
....1... CapabilityHasSpace
......2. CapabilitySupportsChunking
......1. CapabilityWebCamDetected
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B62C9030
However, I haven’t been able to get behind the meaning of the Extended Capability Flags, after the colon, yet. Have you? Leave a note!