I got a message from Microsoft saying that my AdCenter campaign got put on hold "as part of our editorial review process" for not following content guidelines.
Then when I checked what the problem was, it seems that MSFT didn't like me using quotation marks (" ") in my ad headlines. I read through their editorial guidelines and didn't see this specifically forbidden.
Google has no problem with the same ads and I wonder if it was just some new overzealous employee at MSFT that day... Has anyone else had similar experiences with AdCenter?
My account stopped running at one point. When I sent a message asking why, I got a phone call that day and they explained that too many of my landing pages had popups. I removed all the popups and let them know about, and my account starting running again the next day.
So yeah, I've had some problems, but at least they don't ban your for life like Google does.