Gallery of operating system user interfaces over the years

From DownloadSquad:

It’s easy to forget all of the computing operating systems that existed before Windows, Mac OS, and the various flavors of Unix / Linux. But if you ever feel like taking a walk down memory lane and checking out some screenshots of some of the oldies, check out the Graphical User Interface Gallery over at Guidebook.

It’s interesting seeing screenshots of some of the old software I used many years ago. Check it out!

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