Joining it is a bit tricky, since you have to edit msnmsgr.exe. See here for instructions and making an account: https://escargot.now.im#how.
To join, see https://escargot.log1p.xyz/#how. Summarized here:
- Install MSN: pick your language/version, preferably a “Pre-Patched”
Create an account
- If you want to be able to log in to MSN 1/2/3/4, check the Old MSN support checkbox when you create an account. If you already have an account and want to add/remove old MSN support, for now you have to go through the reset password process to do it.
If there isn’t a suitable pre-patched version, here are the instructions for patching: https://escargot.log1p.xyz/#patching.