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We have received a substantial number of reports from people unsuccesful at signing in with the public release of MSN Messenger 6.0. The solution is: perseverance! If the log-in process freezes, you might want to try this simple -but in many cases effective- solution:
1) Close down MSN completely (tray icon should be gone), go to your Settings > Configuration > Software and uninstall MSN Messenger 6.0 again. If the system prompts for a reboot, do so.
2) Download the public preview for the appropriate OS again (over here) and just to be sure, close all running applications before you install it. Again, if the system prompts for a reboot, do so (but it's not likely to happen).