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Tablet PC, 2005
While Microsoft and its hardware partners continued to push Tablet PC hardware (such as in this stunt where cartoonists drew caricatures using the device) they failed to gain much traction beyond particular business niches.
Asus R2H ultra mobile PC, 2006
The ultra mobile PC was part of Microsoft's attempt to get consumers excited about tablets back in 2006. This Asus R2H ran Windows XP Tablet PC Edition, and had a passive rather than an active touchscreen. UMPCs struggled to find a market — too expensive for the consumer, they were rapidly overtaken by netbooks.
Courier tablet, 2009
Here's one that Microsoft didn't make but probably should have — the Courier never made it any further than a lavish mock-up, but the unique design had a lot of industry watchers excited back in 2009.