Microsoft’s “Core Fonts” used to be freely available on Microsoft's website.
Unfortunately, these have now been removed, apparently because they were being repackaged, modified and shipped with commercial products in violation of the end-user license agreement.
However, as per the license, it is possible to redistribute the fonts provided the packages are not modified, as is the case below.
To extract the fonts from the `*.exe` files on OS X, you’ll need cabextract (available via homebrew and MacPorts).
198383 2002-08-14 08:30 andale32.exe 554208 2002-08-14 08:30 arial32.exe 168175 2002-08-14 08:30 arialb32.exe 246007 2002-08-14 08:30 comic32.exe 646368 2002-08-14 08:31 courie32.exe 392439 2002-08-14 08:31 georgi32.exe 173287 2002-08-14 08:31 impact32.exe 661728 2002-08-14 08:31 times32.exe 357200 2002-08-14 08:31 trebuc32.exe 351991 2002-08-14 08:31 verdan32.exe 185071 2002-08-14 08:31 webdin32.exe