Organizing and accessing contact information in Outlook.com
Yes they are back, but still missing most of their content.
Its a step in the right direction though.
I have/had several dozen of my groups that contained upwords of 200 people, which I believe is the max amount anyways, but some of those group's are now EMPTY, with no contacts.
I will be patiently waiting & hoping for a resolution. I have no way to re create them on my end.