Go to Microsoft adCenter and click "Sign up now". You can manage other Microsoft advertising services through this account, such as Bing PPC (If you already have an adCenter account, then log-in and skip to step 3).
Complete the registration process. You will have to supply a credit card; this will not be charged but only used for verification purposes.
Once registration is complete, click the "Tools" tab and select "Bing Shopping Account Management".
Complete the Account Set Up information. An 88 x 31 px logo is required for activation.
Click "Catalog Management" and select "Microsoft download".
Leaving this screen for a moment, log-in to your MightyMerchant site manager in a new tab or window. Click "Catalog" and then "Data Feeds". Select the URL in the text field corresponding to the Bing feed and copy it.
Return to your Microsoft "Catalog Management" screen and paste the URL into the "Source URL" field. You may leave the User name and Password fields blank. Click "Save".
Microsoft will email you when your feed has been processed. This may take several days.
Microsoft will regularly pull a fresh feed from this location.