Sitecore ECM - Remove App Center Warnings

Did you not purchased the Spam Detecter and/or the Email Preview service from the Sitecore App Center? ECM will constantly warn you with red massive ribbons as showed below. It is really a disturbing warning, when you work with the ECM (version 2.x).

If you want to remove the warnings, you simple have to delete the two following items (remember to back up the two items):

• /sitecore/system/Modules/SPEAK/EmailCampaign/TaskPages/AdHockTaskPage/Review/EmailPreview
• /sitecore/system/Modules/SPEAK/EmailCampaign/TaskPages/AdHockTaskPage/Review/SpamCheck

Here u go, After removing the two items, ECM no longer shows the warnings.