Hi Kelvin,
Jabber Video for TP (4.6) doesn't have IM capabilities. Previous version (Movi 3.x) actually had IM capabilities, but was later on built as a (simple) video only client (with standard capabilities as presence, phonebooks etc.).
If you need IM, outlook integration etc., you should look into the new Jabber for Windows/MAC 9.2.2.
More info here:
http://www.cisco.com/en/US/products/ps12511/index.html
You would then need a UCM gatekeeper instead of the VCS.
Let me know if you have any more questions.
Regards,
Arne