The forums aren't a place to ask support for a beta. If you are a beta tester, go ask in the correct places. If you're not, either live with it or go back to 6.2. You won't (or shouldn't, rather) be getting support from here.
ES put it best:
quote:
*sigh* all you people having problems with MSN Messenger 7.5, stop using it. If you are a beta tester, you should be shot. You are not allowed to discuss it in here and those that know the solutions to your problems will *not* assist, so stop asking. MSN Messenger 7.5 is a BETA for a reason.
Now stop using it unless you're a tester or keep quiet about the many problems you'll face using it. No one's listening - at least no one that matters and no one that can help you will help you.
If you haven't gotten my point yet, I'll be blunt.
STOP USING LEAKED BUILDS OF MSN MESSENGER 7.5 and then saying it's so CRAP. It's a freaking BETA, it's not meant to be perfect or stable. A BETA is meant to be tested. The TEAM OF BETA TESTERS is meant to find bugs and report them, not you. Now stop complaining about bugs and instability or the inability to sign in. It's a BETA, go-freaking-figure!