RIM is licensing Microsoft's exFAT file system to make data on its BlackBerry devices compatible with more platforms and devices.
About 5.4 million Windows Phone devices were sold in the quarter, for a 3.5 percent market share, up from 2.3 percent a year previously.
Fragmentation of the BlackBerry infrastructure companies use to manage their mobile devices could spell doom for BlackBerry 10 and RIM.
An attached file is loaded up with malware to take over the victim's computer should he or she open it.
WinPho's market growth and BlackBerry's free fall combine to push smartphones running Microsoft's mobile OS past the Canadian smartphone maker.
Gartner analysts report a second-quarter shuffle in the smartphone market, with declines by Nokia, LG, and RIM.
Web usage by iPhone and iPad owners has grown by 35% in North American over the past year, while browsing with BlackBerry smartphones and the PlayBook tablet has dropped by 25%.
A 32GB model of the 7-inch tablet with LTE cellular connectivity will be rolled out in most markets over the next few months.