Wikipedia:

Adobe ported these products to the Microsoft Windows operating system platform, 
where they managed font display by patching into Windows (3.0, 3.1, 95, 98, Me) 
at a very low level. The design of Windows NT made this kind of patching 
unviable, and Microsoft initially responded by allowing Type 1 fonts to be 
converted to TrueType on install, but in Windows NT 4.0, Microsoft added "font 
driver" support to allow ATM to provide Type 1 support (and in theory other 
font drivers for other types).[citation needed]

As with ATM Light for Macintosh, Adobe licensed to Microsoft the core code, 
which was integrated into Windows 2000 and Windows XP, making ATM Light for 
Windows obsolete, except for the special case of support for "multiple master" 
fonts, which Microsoft did not include in Windows, and for which ATM Lite still 
acts as a font driver.[citation needed]

ATM Light is still available for Windows users, but ATM Deluxe is no longer 
developed or sold.

Users of ATM 4.0 (Light or Deluxe) on Windows 95/98/ME who upgrade to Windows 
2000/XP may encounter problems, and it is vital not to install version 4.0 
into Windows 2000 or later; affected users are encouraged to visit the Adobe 
web site for technical information and patches. Version 4.1.2 is fully 
compatible with Windows 2000 and XP (It will run on XP 64 bit, but the 
installer doesn't work so you have to install it on a 32bit version then copy 
over the files).

Windows Vista is incompatible with both ATM Light and ATM Deluxe. Windows 
Vista can use Adobe Type 1 fonts natively, making add-ons like ATM unnecessary.

The latest version of ATM for Windows 3.1 is 3.02. There was no ATM Deluxe for 
Windows versions prior to 95.

Acrobat Reader, starting with version 2.1, installs a version of ATM for its 
own use, referred to as a Portable Font Server, but there is no control panel 
or other user interface for it.[4] It is therefore unsuitable for the tasks 
which most people need to install ATM for.
