Parallels has issued a new update for its Desktop for Mac software.

The update introduces support for Intel Macs with over 2GB of memory installed and offers a new virtual disk cache option that lets users optimise either Mac OS X or the hosted operating system.

The update also offers support for Windows Vista, so Mac users can run Microsoft's forthcoming operating system on the same machine as Apple's Mac OS X.

The update also supports Mac OS X 10.5 Leopard, delivers better support for USB devices (including Windows Mobile 2005 and webcams), and delivers full support for OpenBSD 3.8 as a guest operating system.

Parallels Desktop for Mac costs £49.96.