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spec: To help counter the region 's dearth of safe , affordable housing , the foundation made a $ 2.5-million loan to the City of St. Paul to provide short-term , low-interest loans to projects to expand low-cost housing . '' Technical work on interoperability issues around Windows , Linux , Unix and open-source software is also taking place in Microsoft 's open-source software lab , and the company has set up a community Web site , Port 25 , about the issue .