OpenType and Windows TrueType fonts are usable on both Windows and MacOS X. Windows Type 1 fonts can be used with Adobe applications on both Windows and MacOX X (although on the Macintosh, the Windows Type 1 fonts must be put into the Creative Suite's private font directory).
Macintosh Type 1 and TrueType fonts cannot be used on Windows systems under any condition.
Going forward, for cross-platform compatibility, at Adobe we would strongly recommend exclusive use of OpenType fonts, thus avoiding the need for purchasing more than one version of any font.
- Dov
- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)