Microsoft wants to know how its software donations through Tech Soup have helped charities and libraries in the United States and Canada — so it’s holding a contest to find out.

Winners of the Microsoft Impact Story Contest 2009 will be chosen based on their ability to show how the software helped the organizations stabilize and strengthen their technology systems, improve the services they provide, or do their work in new ways.

Contest winners will be announced June 26, and receive $5,000 in cash and Microsoft products worth $25,000.