I can run Parallels forever without a glitch, and I can run Entourage equally well. However, running both Parallels and Entourage together for any length of time (more than a couple of hours) is a sure-fire recipe for the spinning beach ball of death. Once I reach this point, my Mac continues to run, but so slowly that it's useless (responds to one click every 3 to 5 minutes). The only fix is to quit Entourage, or pause my Windows XP VM, but sometimes this takes so long that I just shut down my Mac by holding the power key. Best I can tell, it makes no difference what Windows apps I'm running. Here's my configuration: MacBook Pro with Core Duo (not Core 2 Duo). 2 GB RAM OS X 10.4.9 Office 2004, with all the latest updates Very large Entourage database (about 10 GB) Parallels 3.0, build 4128 Windows XP Professional I really hate using Outlook for email, so I'd like to keep Entourage, but I have to get Entourage to co-exist with Parallels. Anyone else seen this problem?