MS-DOS 2.10

MS-DOS 2.10 is a version of MS-DOS 2.x. It is often MS-DOS 2.01 mislabeled as a result of  reporting version 2.10 upon starting. COMPAQ's MS-DOS 2.11 is in fact the real MS-DOS 2.10 as the kernel,  reports version 2.10 but it was compiled with the   switch on. The  command reports version 2.11 as all IBM version of DOS obtains version number from   rather than the DOS kernel.

IBM PC-DOS 2.10 and MS-DOS 2.11 are the same thing compiled with different switches and COMPAQ normally modifies all IBM branding to say MS-DOS before compiling DOS with the  switch.

There appears to be no real MS-DOS 2.10 compiled with the  switch but the COMPAQ OEM of MS-DOS 2.11 is the only known version of non-IBM branded DOS that has a kernel version of 2.10.