Outlook.com ActiveSync no longer working, even after recreation

My Outlook.com ActiveSync for contacts and calendar simply stopped working a few days ago. The locally added contacts and calendar entries are there, but nothing is synced with MS. In the hope of fixing the issue, I deleted the activesync account (beware: now lost all contacts and calendar entries on device!!) and recreated it. The account is correctly set up, and the email part (that I don't use) seems to work, but *no* contacts or calendar entries are synced down from outlook.com / live.com. Several delete+add and phone reboots didn't help.