Two senior executives have left Research In Motion (RIM). Executives in charge of developer relations and business outreach at Research In Motion have left the company, the latest in a string of departures this year as the BlackBerry maker trims its workforce, according to Reuters. 

Tyler Lessard, the company''s senior vice-president for global alliances and developer relations, "is moving on to pursue other interests," RIM said in a statement on Thursday.

A source with direct knowledge of the situation told Reuters that Jeff McDowell, senior vice-president for platform marketing and alliances, left the company two months ago.

Lessard has been replaced by Alec Saunders, who once worked for QNX Software before QNX was bought by RIM.

QNX software powers RIM's PlayBook tablet computer and will be used in products RIM has dubbed "superphones", which it is set to launch next year.

McDowell, whose job was to expand RIM's global sales to businesses and to market its software and services, was a keynote speaker at RIM's BlackBerry World conference in May.

Saunders will be at RIM's developer conference next month in San Francisco, where a major PlayBook upgrade is expected to add native email and calendar functions, as well as some compatibility with Google's Android software.