Shoutbox

What the patch does, according to my understanding, is change two bytes in the memory that function as a "dogfood" check for your e-mail accounts. Whereas, without patching WLM, upon sign in, WLM checks if the provided e-mail address is part of the dogfood testing, and if so, the connection will pass to MSNP20, if not, the connection is rejected. When WLM is patched, this "check" is eliminated, so you automatically sign in  to MSNP20 regardless of your authority.

Therefore, as David M. Silva said, using WLM2009 won't downgrade your use of MSNP20.