I've read the threads that suggest setting the guest VM memory to 768MB. I've used this setting as well as others I've received from Parallels support but I still have a problem with Outlook. In general the program works fine, opens quickly and changing from calendar to mail or contacts is acceptable in terms of speed. The problem I have is when I'm going through my email messages and i click on one with an attachment it takes a very long time for the message to appear in the preview pane. Again, clicking between messages without attachments works fine it's only when there is an attachment that the system slows to a crawl. I hope someone has a solution to this problem.