App certification is covered here
http://msdn.microsoft.com/en-us/library/windows/apps/hh694079.aspx
some things are guidelines and some are rules
Jeff Sanders (MSFT) @jsandersrocks - Windows Store Developer Solutions @WSDevSol Getting Started With Windows Azure Mobile Services development? Click here Getting Started With Windows Phone or Store app development? Click here My Team Blog: Windows Store & Phone Developer Solutions My Blog: Http Client Protocol Issues (and other fun stuff I support)