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Looks like the official answer is over at http://forum.parallels.com/showthread.php?t=31152 If you're doing an upgrade of an upgrade, you do...
My 3.0 license was also an upgrade license. Should that key be working when the 4.0 upgrade asks for my previous activation key (it doesn't...
http://www.parallels.com/products/desktop/sr/ claims support for the following Linux guests: Linux: CentOS 5.0 & 4.0 SUSE Enterprise Server...