A new version of Microsoft's Internet Explorer comes with an e-mail product, Outlook Express, that automatically sorts out junk mail and puts in the trash. Trouble is, the filter sometimes mistakes legitimate correspondence for spam, and that's what's been happening to the digital Christmas cards that people have been sending via Blue Mountain. Microsoft was ordered to provide Blue Mountain by Tuesday with whatever information it needed to bypass the overzealous filter -- which, ironically, trashes Microsoft e-cards too -- and must post warnings on the product alerting users to the potential for lost mail. Microsoft had tried to defend itself earlier by arguing that the filter did not actually delete mail or make it impossible to read. But as the characters in "You've Got Mail" could tell you, what good is anything if you don't know it's there.