Microsoft Advertising is committed to increasing advertiser demand and growing advertising revenue for mobile app developers. The latest improvements to increase developer monetization and end-user relevancy have just been released – these involve changes in the pubCenter categories used to target ad units. To fully leverage these new capabilities, developers need to visit pubCenter to take action to select one category for each ad unit and align that category with the selection in the Windows Phone Dev Center. This is a category update only and no app resubmission or certification is required. What do you need to do? For new ad units, just follow the instructions in pubCenter to enter the category when you submit new apps. And, enter the same category when you submit new apps to Windows Phone Dev Center. For existing apps that already use Microsoft Advertising ad units, you have until September 12 to update the ad unit information in pubCenter. Ads will not be displayed in your apps after September 12, 2013, if you don’t update the ad unit information. You can read more about this change in the Microsoft Advertising blog post, Changes in PubCenter Ad Units.