With Windows Sandbox, Microsoft is taking a big step towards doing exactly what I've been calling on the company to do for years: Figure out a way to isolate, or contain, legacy desktop applications from the system in a way that doesn't require a complex and manual Desktop Bridge conversion process.
What amazes me most about this development is that Microsoft has been working on the underlying technologies necessary for this solution for decades. And I can only assume that the firm's terrible side-track into a so-called "modern" app platform---first in Windows 8 but continued in Windows 10---is what delayed its inevitable appearance now. But there's no reason to cry over a lost decade. Microsoft is finally on the right track.