You'll need to get a MSN Passport account before you can use MSN Messenger in any application.
You can go to the
MSN Passport site to register a Passport for your current email address, or you can use a
Hotmail account as an Passport.
To setup Proteus to connect to an MSN account, simply add an MSN account, you username should be your passport email address, such as "my_really_cool_user@example.com", and the password you've setup. You should be able to connect fine using these settings.
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