Microsoft’s Windows 8 has reached a milestone 200 million sales, but continues to lag behind its predecessor.

Tami Reller, Microsoft’s executive vice president of marketing, made the announcement during Thursday’s Goldman Sachs Technology & Internet Conference, the company’s first mention of Windows 8 sales rates since May.

“We surpassed 200 million licenses now on Windows 8, which is pretty stunning,” she said, adding that while the platform has received a lot of traction, there is still a lot more work to do.

Redmond launched Windows 8 in October 2012 and sold 40 million Windows 8 licenses in a month, outpacing the previous generation OS in terms of upgrades. In May, Reller announced more than 100 million licenses sold.

But along the way, Windows 8 lost its footing, and fell behind its predecessor, Windows 7, which reached the 240 million mark in its first 12 months.

Microsoft did not immediately respond to a request for comment, but told ZDNet(Opens in a new window) that the number includes Windows licenses that ship on new tablets and PCs, as well as upgrades. It does not, however, include volume license sales to enterprise.

ZDNet noted that Reller did not specifically mention the Windows 8.1 update, but discussed producing operating system upgrades at a “more rapid cadence.” More details about the next Windows 8.1 update are expected at Microsoft’s April BUILD conference. Until then, check out Windows 8.1 Leaks Show Off Much-Needed Tweaks.

For more, see PCMag’s review of Microsoft Windows 8.1 and the slideshow above.