A blog post by Microsoft Germany is urging users still hanging onto Windows 7 to make the switch to Windows 10, warning that the older operating system is less secure, and harder and more expensive to maintain.

The blog post by Milad Aslaner, senior product manager for Microsoft in Germany, reiterated Microsoft’s plan to cut off all support, including things like security updates and tech support, for Windows 7 by 2020. Two years ago, Microsoft cut off “mainstream support” for Windows 7, which meant users still got all the important security updates but no new functions or features.

What stood out most about the post was the negative comments, from a Microsoft employee, about what remains the company’s most popular operating system.

“Today, (Windows 7) does not meet the requirements of modern technology, nor the high security requirements of IT departments,” Markus Nitschke, head of Windows at Microsoft Germany, said in the blog post, which we translated to English via Google Translate. “As early as in Windows XP, we saw that companies should take early steps to avoid future risks or costs.”

By contrast, Nitschke said, Windows 10 offers the “highest level of security and functionality at the cutting edge.” Because of its software-as-a-service model, Windows 10 is always up-to-date, he said. And Microsoft introduced several new security features for Windows 10, such as the Windows Hello feature that lets people log onto their devices via fingerprint, facial or iris recognition, that are not compatible with older versions of Windows.

These comments come as Microsoft tries to turn the page from previous complaints that the company was being too heavy-handed in its promotion of Windows 10. The messages in the German blog post were not accompanied by anything out of Microsoft headquarters in Redmond, Wash. We’ve reached out for further comment from Microsoft and will update this story when we hear back.

Microsoft said in September that Windows 10 has reached 400 million actively devices, at the time 14 months after launching. But it appears quite a few Windows users have procrastinated or resisted switching from Windows 7 to Windows 10.

Analytics company NetMarketShare found that as of December, Windows 7 held the greatest market share among all operating systems for desktops at more than 48 percent. That is down slightly from about 56 percent in December 2015. Windows 10 ranked second and is gaining ground, over the same period, more than doubling from 10 percent market share to 24 percent.

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