Parallels has released Update Release Candidate 2 (RC2) for Parallels Desktop for Mac, its virtualization solution that enables users to run Windows and other operating systems at the same time as Mac OS X on any Intel-powered Mac (without re-booting). The Update RC2, which is free for all Parallels Desktop users, improves support for the recently released quad-processor Mac Pro towers and Core 2 Duo iMacs by enabling users working with these machines to use Parallels Desktop with any RAM configuration, including Mac Pro towers equipped with up to 16GB of RAM, without modifying their systems. Previous versions required a free (bundled) utility that helped users configure Mac Pro towers and Core 2 Duo Macs with more than for 2GB of RAM. Upgrading will not require a re-install of any guest operating systems or any applications; however, users should also re-install Parallels Tools after upgrading to the Update Release Candidate 2, the company said. The final release of the Update is expected in the next few weeks. A 15-day trial of the $80 application is available online.