Template:Did you know

...that Windows 95 build 58s includes a hidden tabbed mode in the Cabinet?
...that the WarpCenter shell included in OS/2 Warp 4 build 9.012 refers itself to as Lotus SmartCenter?
...that Windows XP build 2223 had commented out code in its Business theme file that would allow the user to configure different colors based on its settings?
...that there was an E variant planned for Windows 7 in addition to K, N and KN, which didn't include Internet Explorer?
...that in 1985, Microsoft produced a multitasking MS-DOS that natively supported preemptive multitasking and would later become the base for OS/2?
...that Apple has officially released several developer releases of what would later become Mac OS X for the x86 architecture as a part of its NeXT legacy, and secretly continued to maintain the port until Tiger?