Just in time for Valentine's Day, the matchmaking Web site, Match.com, is practicing what it preaches with a public display of affection. Match.com is nestling up to Microsoft's Windows Server 2003 and related technologies, including the Visual Studio .Net 2003 development tools and ASP .Net Web-services software. "We partnered with Microsoft because we knew they'd be there to support us," chief technology officer Mike Presz said in a written statement, using language one might expect from a love-struck user of his company's site. Embracing Windows was not always easy. Before switching to Windows Server 2003 in the middle of last year, Match.com's applications, written with earlier versions of Microsoft tools, ran on the Windows 2000 operating system. The code on the site had been patched and changed so many times it caused reliability problems, according to Louis Bardov, Match.com's VP of development. "We had issues with stability,'" he says. Some Match.com customers can relate to that.