I believe we reported this in November 2011, where advertisers using Microsoft adCenter haven't seen updated search volume data since early November.
The issue is specifically with the Excel Ad Intelligence plugin, where there is no new data since November and the November and October data was "questionable" to many advertisers. Since then, Microsoft said they are working on the problem, but two months later, still no fix.
Ricky Poole from Microsoft updated several forum threads saying:
I will reach out to the engineers and try to get an ETA. Please note, they are working on this fix and it is definitely a priority to have MAI functioning correctly.
More info to come.
Thank you for your patience :-)
How much longer do they have to wait? Who knows but not a good thing for advertisers looking for more ways to spend their budgets with adCenter.
Forum discussion at Microsoft Advertising Help.