When Acer announced the Aspire S5 ultrabook at CES earlier this year, the company was eager to call it the world's thinnest at 15mm, happy to tout the Thunderbolt port, and content to divulge a Q2 release window. What it wasn't so clear on were more specific specs and pricing. Well, courtesy of the Microsoft Store, we now have both: $1,399 for a laptop with an Intel Core i7-2517U Ivy Bridge processor clocked at 1.9GHz, 4GB of RAM, a 256GB SSD, and a 13.3-inch 1366 x 768 display. The Thunderbolt port is still here behind a clever mechanized "Magic Flip" port door — along with 2 USB 3.0 ports, HDMI, and a DisplayPort.

While you're perusing Microsoft's wares, take a moment to glance at the Acer Aspire TimelineU M5-481T, a 14-inch rig that's essentially the budget version of the sturdy Timeline Ultra M5 we saw earlier today. For $729, it drops the Nvidia GPU and offers you a 1.7GHz Core i5-3317U, a 500GB HDD, 20GB solid state cache, DVD drive, and a 1366 x 768 screen.

Microsoft is estimating that both will ship on June 25th — and naturally if you preorder from Microsoft either would will be a "signature" PC that's pre-configured and free of the "extras" that Acer might otherwise foist upon you. They'll also be eligible for the $14.99 Windows 8 upgrade program, and we wouldn't blame you if you were looking forward to that as well.