What are most of you using for Mail Application

Hi

Just finish installing WIN 7 PRO full version and also install MS Office XP which I use Outlook 2002 but noticed it's always asking for my password which usually it did not and am basically tired of minor but annoying hiccups with the program so was thinking about switching to a different application but no Windows mailing system since from what I can read there are allot of glitches, did try Eudora but for some reason it's always having issues connecting to my mail server even though it's setup the same way as Outlook and don't have any issues with Outlook towards sending/receiving.

Heard Thunderbird is also good but never tried it.

Know that there are allot of opinions towards what works and not so I would like what you guys/gals might suggest.

Thanks

Windows Live mail

Office Outlook {2003 > 2007> 2010}