If you are planning to upgrade to Snow Leopard (aka Mac OS X 10.6) or Windows 7:

QuarkXPress 8

QuarkXPress 8 is officially supported under
Mac OS X 10.6 (Snow Leopard),
Mac OS X 10.5 (Leopard),
Mac OS X 10.4 (Tiger),
Windows 7,
Windows Vista and
Windows XP.

QuarkXPress 8 and Snow Leopard (OS X 10.6)

Plese make sure that you use at least Mac OS X 10.6.2 when using Type-1 fonts with QuarkXPress.

QuarkXPress 7

Make sure you install (or update to) the latest version of QuarkXPress 7 (which is v7.5).

Though we do not foresee any issues why QuarkXPress 7 shouldn't run under these operating systems, Quark does not support QuarkXPress 7 under Mac OS X 10.6 (Snow Leopard) or Windows 7.

If you want official support, please stay with your currently supported operating system (QuarkXPress 7 is officially supported under OS X 10.4 & 10.5 and Windows XP & Vista) or consider upgrading to QuarkXPress 8.

Thanks!
Matthias