If you experience problems with such old fonts, you should try to upgrade them to a Unicode version, or switch to the nearest modern equivalent sporting proper Unicode support. However system software maps their limited character set into the vast Unicode world fairly reliably. Those that remain based on 8-bit (non-Unicode) encoding should be avoided where possible, as OS X works natively in Unicode, which they cannot fully support. dfont file extension, generally work well, and are the antecedents of the OpenType format. TrueType fonts for Macs and Windows, including Unicode variants with a. Although you are most unlikely to install any of these yourself, they can leak across when you let the Migration Manager upgrade a new Mac from an old system, or when upgrading OS X.

Those that can cause problems include old bitmapped, very old PostScript Type 1 and 3, and some Windows and Linux PostScript Type 1 fonts. OS X is remarkably catholic in its taste for fonts, coping comfortably with a wide range of formats and languages. Font-related issues are not uncommon, sometimes reaching the point where they have rendered Macs unstable or unusable. However this complexity makes it easy for human errors and errant software to cause problems. The Mac was the first popular computer to use high-quality display fonts, and although this has become considerably more complex since, there is no reason that fonts and their management should get in the way of your work. With popular applications such as Microsoft Office installing their own fonts, the non-specialist user needs to understand how to manage fonts properly, and might even find that a font manager makes life more productive.

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