I have the same problem with the Upgrade key and a UK version of 2.5.
I contacted order support and included both keys in my email. I received the following standard reply:
Parallels Desktop 3.0 is a major upgrade for Parallels Desktop and it
will work with the new 3.0 activation key that comes as separate
purchase, either full version or upgrade version that is available for
the owners of the previous Parallels Desktop versions. You can order
Parallels Desktop 3.0 US version online on our website
http://www.parallels.com or purchase at the nearest retail store when as
soon as it is shipped.
If you have ordered Parallels Desktop 3.0 key already and you are
experiencing problems with activating the product, please send us your
key for verification.
My standard message to parallels support - Thank you for not bothering to read my email!!!!
Support of this low quality does not reflect well for the product future.
Stuart
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