On January 27th the MSDN blogs user accounts merged with the MSDN Forums Profiles.
This is part of a profile centralization effort, which consolidated our users’ profile suites down to a single account to be used across the MSDN websites.
There is one of two options you will encounter as a previous user of MSDN.
For those who don’t yet have a user account or a MSDN Profile, you will be guided through the new MSDN Profile creation process. From that point forward, MSDN will use the MSDN Profile automatically.
You are not required to create an MSDN Profile to read a blog or other MSDN content. You will need a profile to add MSDN Community Content, and some blogs will require a Profile to post a comment there.
We are very excited about bringing the Blogs to the MSDN Profile. This is a tremendous step forward which will make an already awesome community that much richer!