We just wanted to let Parallels Desktop 4.0 for Mac users know that they can update to Apple’s new release – 10.5.7 for all Macs with OS X (10.5 Leopard) – in safety. Some may have been concerned by reports that VMware is encouraging certain Fusion users to not update their computers as it may result in "slow performance, ...incorrect rendering, and even crashes, when you run your 3D applications."
To make certain our users are not vulnerable to similar problems, we tested 3D applications using Fusion and the new Apple update and unfortunately experienced the crashes and artifacts in the rendering they warn of. We ran the same tests using Parallels Desktop 4.0 for Mac with no such problems. We've tested multiple systems, double-checking this scenario, and everything is spot on.
If for some reason you prefer not to use Apple Software Updater, the 10.5.7 update can be found HERE, along with the release and change notes.
If you do experience any problems of any kind with 3D graphics, be they related to the update or not, please do let us know – we’re committed to delivering the best possible 3D graphics rendering possible in a virtual machine and all feedback helps us with that.

Hi, no need to mean. Some of us are users of both Fusion and Parallels and quite happy with both, thanks you.
Posted by: emg | May 16, 2009 at 10:52 AM
Glad to see you're a happy user, emg. There wasn't any intention to be mean here, and I'm sorry if it seems that way to anyone. The purpose of the blog was just to reassure Parallels users who were concerned over the Mac OS X update.
The quote was taken from VMware's response to the Fusion problem, so they and Fusion users are aware of what's happening.
Posted by: Sean Gibbons | May 19, 2009 at 01:46 PM
i am really happy with my MAC. Also have no problems with the PD 4.0.
Posted by: oyunlar | September 19, 2009 at 02:16 PM
I've got Norton's anti-virus on my Mac, do I need anti-virus on my virtual machine?
Posted by: Sandra Buttery | November 04, 2009 at 08:47 AM
You can install any antivirus software in your virtual machine, just like in regular PC running Windows. Parallels Desktop provides built-in antivirus software – Parallels Internet Security powered by Kaspersky, with a 1-year free license. However, any other antivirus software can be used.
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Posted by: peynir | December 15, 2009 at 07:31 PM