The new Windows kernel is 25 megabytes.

Microsoft has developed a new software kernel MinWin, individual components of which in the future may become part of the new Windows operating systems.

According to PC World, the MinWin core was demonstrated by Microsoft engineer Eric Trout as part of a special presentation at the University of Illinois. According to Trout, the emergence of MinWin proves that Microsoft can create small software kernels. MinWin occupies only 25 MB of disk space and requires less than 40 MB of RAM. For comparison, Windows Vista with a full installation will take about 4 GB of space on the hard drive, and for this software platform to work, at least 512 MB of RAM is required.

True, MinWin functionality is seriously limited. The new kernel does not have a graphical interface and displays all the information in text form. In addition, according to Trout, he expected that MinWin with the current feature set would take less than 25 MB.
')
It is possible that the individual elements of MinWin will be used in the operating system with the code name Windows 7, which will be the successor to Windows Vista. About Windows 7 is not yet known too much. Microsoft previously reported that this operating system will be released in client and server versions and will support both 64-bit and 32-bit processors. To complete work on the software platform, Windows 7, Microsoft expects within three years.

CitCity source

Particularly pleased with the first comment:

Aku-Aku, Tuesday October 23, 2007 11:54:29:
“Microsoft can create small software kernels. MinWin occupies only 25 MB of disk space and requires less than 40 MB of RAM. ”

Ha ha ha and ha

Under Linux to load the kernel floppy enough
and if you add a couple more, you can raise the graphics ... and all this with a memory requirement of 16 MB

and here ... only in text mode and as many as 40 are needed ... aaaaaaaaa ... hold me three :)))))))))))))))))))))))))))))))) )