I'm not sure if you can integrate with MS OFfice Communicator 2005 or live
meeting.
Pbly the next version of sharepoint might have this facility.....

If not, groove [now with MS] would be a good option.

What to do if Site administrator account is deleted.
I recreated the account with the same name then also it gives Access
Denied.

2. How can I allow anonymous users to manage webparts. as in ASP.net there is
AnonymousIdentification
3. I forgot my excel document password. anyone having s/w to crack that
password.