URL by Match Type is new functionality being introduced by Microsoft Advertising. Previously, Microsoft Advertising/adCenter would only allow a keyword to have different bids for each match type and one URL. Now, similar to Google Ads, AdCenter is enabling a keyword to have only one match type and bid. This means:
Starting July through September 2015, Microsoft Advertising will begin to migrate all US accounts to the URL by Match Type. You will experience the following on Microsoft Advertising's side while your accounts are being migrated:
Once your account has been migrated by Microsoft Advertising, it will undergo a Marin migration to make it compatible with the URL by Match Type feature.