For those too young to know about Clippy (Office Assistant) from Microsoft Office ’97 here’s a brief history. As an annual holiday tradition, Microsoft Corporation 454,46 +2,87 +0,64% features an ‘ugly sweater’ for sale and this year’s features Clippy. Microsoft’s now-yearly tradition of releasing ugly sweaters with retro Windows patterns printed on them. Two years ago, the patterns were MS Paint- and Windows logo-themed. Last year’s pattern paid homage to Windows 3.1-era Minesweeper. And this year’s brings back an old frenemy: Clippy. The Clippy sweater is available in sizes small through 3XL and costs $75 no matter what size you get. That’s a bit on the…