The MSDN and TechNet blog migration is on its way. The process of backing up the millions of posts, users, comments, images, files and profiles has begun the journey to the new platform. It started on Sunday May 16th at about 9pm PDST. it's going to be May 24th around 12pm PDST before everything is back online.
Please note that during this period commenting will be turned off.
The Official blog reports -
“As the week goes on, I'll try to provide more insight into just what's happening in the migration, more details on the new features and anything else that might be interesting for folks to know.
This is a big, big migration (and long overdue) so we thank you in advance for your patience and grace as this move takes place!”