InformationPlease follow these steps to upgrade to Mac OS X Lion if you have Parallels Desktop for Mac installed:
1. Make sure you meet Lion system requirements
2. Update your Parallels Desktop to the latest build
3. Shutdown your Parallels virtual machines and quit Parallels Desktop
4. Turn off any kinds of virus protection on your Mac - Little Snitch, Kaspersky Antivirus, etc.
5. Follow the steps from official Apple website