Despite the onslaught of rival smartphones like the iPhone, Android, and Windows Phone 7,  Research in Motion will maintain the top spot when it comes to worldwide market share until 2015, according to a study from ABI Research.

The study found that RIM will lose market share by 2015. The research firm expects RIM’s BlackBerry to maintain 26% of the mobile operating system world market by 2015, matched by Google’s Android OS with 26%. Nokia’s Symbian OS will take 16%, Microsoft Windows OS 11% and Apple iOS 14%.

What do you think?  If RIM continues to lose share as fast as they have for last two quarters they will lose their spot atop the smartphone market share hill much sooner than 2015.  Can RIM do enough to hold their competitors off for the next 4 years or so?  Time will certainly tell…