The latest AdDuplex report shows that the April 2018 Update has been rolled out to over 78 percent of Windows 10 PCs out in the world.

“April 2018 Update continues its speedy march through the PC world and is now on 3/4 of all PCs running Windows 10 according to our data,” AdDuplex notes. “The almost vertical growth line for the update is unprecedented in Windows 10 history.”

This report is the second to appear within the April 2018 Update’s lifetime. In last month’s report, AdDuplex first noted the historic speed at which the update was deployed, with the April 2018 Update rolling out to fully half of all Windows 10 PCs out in the world.

Two weeks later, Microsoft confirmed AdDuplex’s contention that the April 2018 Update had been deployed over twice as fast as the previous feature update, the Fall Creators Update. However, Microsoft’s data showed a very different figure for the total number of PCs to which the update was deployed. (250 million for Microsoft vs. 350 million for AdDuplex) The discrepancy is likely due to the fact that many corporate PCs don’t use the mobile apps on which the AdDuplex data relies.

In any event, AdDuplex also looked at PC maker usage share for the month, the first time it’s done so since March. Little has changed: HP is still number one, with 27.45 percent of all Windows 10 PCs out in the wild. They are followed by Dell (18.45 percent), Lenovo (12.3), ASUS (8.06), and Acer (7.99).

Microsoft, if you’re curious, only accounts for 2.51 percent of all Windows 10 PCs out in the world. This neatly highlights how few computers the company really sells: 2.51 percent of 250 million is just 6.25 million units. (2.51 percent of 350 million is 8.8 million units.) Those numbers aren’t “sales” but rather usage share, or “PCs out in the world,” so they represent a sum of sales over a period of years. For perspective, Apple sells 4-5 million Macs every quarter.

As a reminder, AdDuplex is the largest cross-promotion network for Windows apps, and the firm empowers developers and publishers to promote their apps for free by helping each other.