For those Windows Phone owners that have recently updated to the latest version of Windows Phone, you may have noticed problems with downloading and installing applications after updating. There’s a good reason for that as detailed by team member Mazhar Mohammed:
What’s going on
We’ve run into an issue with the digital certificates used to sign apps, and this is preventing some phones from installing some apps published during the last couple of days.
We’ve investigated and determined the issue only affects phones that upgraded to Windows Phone 7.5 from an earlier version of the operating system. It does not appear to impact phones sold with Windows Phone 7.5 preinstalled.
We estimate the issue also affects only a small percentage of the 100,000-plus apps in Marketplace. Among the more popular ones affected are the New York Times, What’s App, and Translator from Bing—all of which recently issued new updates.
There’s nothing wrong with your phone and everything else should work fine.
As a result of this unexpected issue, Microsoft has also temporarily halted app submissions and app update submissions until the certificate issue can be resolved with dedicated forums for consumers and another notice for developers to answer more in-depth questions on the revised app certification process going forward after this issue is eventually resolved. This post will be updated when more concrete information on a fix is posted by the team.
Update – 8-17-2012: Microsoft has updated with the following statement, found below -
UPDATE (16 AUG) We fixed the digital certificate problem and last evening resumed publishing new apps. It will take a day or two for the repair to fully deploy and newly-published apps to begin appearing in Marketplace again. If your app was in the process of being published, you don’t need to take any action. We have applied the fix and the app will continue through the certification and publishing workflow as normal.