Microsoft released the Windows 10 Anniversary Update on August 2. The massive refresh brought many new features and a lot of smaller tweaks as well. Redmond noted that the update was "rolling" meaning not everyone would see the 3.5 GB update on that Tuesday. Instead, devices that shipped with Windows 10 would get the update first, with older devices coming later.

Those numbers are reflected in the latest AdDuplex numbers for August. A staggering 77.2 percent of all PCs, tablets, and laptops are still on the 1511 branch (Threshold 2) from 2015 and have not taken the Anniversary Update just yet. Those running the Anniversary Update account for 16.2 percent of all PCs and two-in-ones according to AdDuplex with 0.6 percent on Redstone 2 as Insiders – the next iteration due in 2017.

It is not clear why so many PCs have not yet received the Anniversary Update. Users could delay the refresh, or many older PCs are just not eligible yet as Microsoft ensures stability and updated drivers are available. Some users may also not be aware that they can force the update instead of waiting on Microsoft.

How to get the Windows 10 Anniversary Update

Ironically, Windows 10 Mobile Anniversary Update already accounts for the majority of Windows 10 Mobile devices despite being two weeks behind in delivery to users.

We'll have to follow the uptake of the Windows 10 Anniversary Update for PCs over the new few months to see if there is a dramatic shift. At least developers know they have some time before they should start implementing new features into their apps like Chase-able Live Tiles and web-app links.

It should be noted that most companies are still on older versions of Windows, and those who are Windows 10 will likely sit out the Anniversary Update for a few months until the first significant cumulative update arrives to address any initial issues like the webcam driver problem.

About AdDuplex

The numbers from AdDuplex are collected through their in-app advertising that is prevalent in over 5,000 apps in the Windows Store. That data serves as an important metric within the Windows Phone ecosystem. The full AdDuplex report for August will be posted on their blog at on Thursday (August 25).