recently microsoft changed there login protocol.
what version of gaim are you using ???
you need version 0.71 or later !
like trickykid said you need to post more info than just saying it doesnt work...
However, if gaim used to work, and now it doesnt, i would say this is your problem, upgrade. (the version of giam that comes with redhat will nolonger work, it is very old)