*Sigh* Some people still don't know although our FAQ about it was already viewed by almost 2 million Messers. But here we go again:
MSN BLOCK CHECKERS DO NOT WORK!
They used to, but then Microsoft got smarter and fixed the glitch. To this day a lot of sites, crammed with ads and even trojans, still try to make you believe it's possible to check the real status of one of your MSN Messenger contacts. But no can do.
Fed up with seeing his contacts get infected by one of those fake MSN Block Checkers (
www.block-checker.something to be precise but do NOT visit!), John Potter (aka BritishNimrod) wrote a simple scanner that cures your system from the adware and other black magic it performs.
>> Download the MSN Block Checker Virus Scanner.
>> Or check our forum to manually remove block-checker.
I assume people who visit this site don't need this because they're smart enough to ignore MSN Block Checkers in the first place, but bear in mind that millions of other Messenger users are susceptive of their trickery. So spread the word and feel free to link to our FAQ: Can you see who blocked you on MSN Messenger. Trust me, it'll save you from a lot of IM spam and unpaid helpdesk work later!
Tomado de
http://mess.be/
En resumen: si alguien tiene en messenger la opción "Solo personas en mi lista de admitidos pueden ver mi estado y enviarme mensajes", no es posible verificar si te tienen bloqueado o no, y como ahora esta opción viene activada por defecto despues de instalar, ... pues bueno, ya saben.