Is it ok to use 4.6.0073? Because I need the Dutch version.
yes. as long as it’s below 4.7.2009
I now get the message Logon at Microsoft Exchange Instant Messaging failed because the service is temporarily unavailable. Try again later.. And I did patch it. 
make sure you’re logging in with the option .NET Messenger Service
It finally worked! I created the value Server again because I reinstalled MSN, then it didn’t work, later I realized in the settings it said that I’m using MEIM, so I changed it to .NET, and then it WORKED!!! 

(hopefully I’m not spamming)