Two weeks into its phased rollout, the Creators Update (version 1703) is on about ten percent of Windows 10 machines.

That number comes from AdDuplex, which collects statistics from Windows 10 machines running apps built with its advertising SDK. 9.8 percent of Windows 10 machines are on 1703, 82.1 percent are on the Anniversary Update, 6 percent are on version 1511, and just 1.8 percent are on the original RTM release.

That original release (sometimes known as 1507, following the year-year-month-month naming pattern used for subsequent releases) moves out of support on May 9. Although Windows 10 itself has a minimum of ten years of support, maintaining that support will still require periodic upgrades. This is not an entirely new policy; in the days of Windows Service Packs, the release of a new Service Pack would start a two-year countdown for support of the previous Service Pack. After those two years, only the new Service Pack would be supported. The timetable is a little condensed, however; Windows 10 1507 is not yet two years old, and it won't be two years old when it falls out of support.

So far, the Creators Update doesn't have any of the awkward problems that struck the Anniversary Update, but Microsoft is nonetheless sticking to its fairly conservative deployment process. The company uses the telemetry data collected from real installations to detect compatibility issues or installation problems. Systems with hardware, drivers, or software that are known to be problematic can be blacklisted until such a time that a fix is identified.

Microsoft has described one such blacklisting for the Creators Update; certain Broadcom Bluetooth radios are experiencing problems with device reconnection. For the time being, systems with that particular Bluetooth hardware won't be offered the Creators Update through Windows Update. This doesn't block manual installation, so anyone who wants to upgrade regardless of the problems is free to do so, but the move should protect most Windows users from problems.

The AdDuplex numbers offer a little additional detail when it comes to PCs from major OEMs. Most OEMs are hovering at around the same 10 percent deployment rate, but just over 20 percent of Microsoft Surface PCs and just under 20 percent of MSI branded machines are running the Creators Update. Of the Surfaces, almost 30 percent of Surface Books have been sent the Creators Update and around a quarter of Surface Pro 4s. Older machines have lower upgrade rates, with the Surface Pro 2 below 7 percent. Microsoft clearly seems to be favoring its newest machines.

Today was supposed to be the day that the Creators Update was shipped to certain Windows 10 Mobile devices. The Creators Update won't be available for every phone that's currently running Windows 10 Mobile; some older devices are being left out in the cold. AdDuplex's figures suggest that around 60 percent of Windows 10 Mobile phones will be eligible for the update.

But the situation is all a little murky. In an update published today on its Feedback Hub (not available through a browser, alas) Microsoft said two things. First, the Creators Update (build 15063) is being published not to the stable release channel but to the Release Preview ring. As such, that stable release seems to be a little delayed.

Second, the company said that owners of 40 percent of phones that won't be supported in the Creators Update will still be able to upgrade, albeit without support, by switching their phones to use the Release Preview ring. However, reports from people who have tried this suggest that this isn't working; their phones aren't being offered the update at all, even after switching to the Release Preview ring. It's possible that the cause is merely a consequence of the phased rollouts and delays that can occur when switching between different release channels.

Update: Microsoft's Dona Sarkar says that the update is now rolling out to the supported phones.