Exchange 2003 Lost Install key want to upgrade to Exchange 2010

After migrating Exchange to a VMware drive, the  client lost their Exchange 2003 install key, and they need to make some changes.   The screen continues to prompt to "validate", and when they select, remind me later, it locks the screen.

They's like to upgrade to Exchange 2010.   What is their upgrade path options?
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James PowellData Analyst / Online Retail DevelopmentAsked:
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SStoryConnect With a Mentor Commented:
ProduKey key finder claims to work to recover a lost key from a valid install.
http://pcsupport.about.com/od/productkeysactivation/tp/topkeyfinder.htm
I have never used it, but I have used others.
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James PowellData Analyst / Online Retail DevelopmentAuthor Commented:
Thanks for your input.  I've used some of these tools in the past.   Was also looking for Microsoft support type experience with moving from Exchange 2003 to Exchange 2010
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SStoryCommented:
I do not use either so could not help you.   I use Postfix. It is
simple to use, runs on Linux and costs nothing.
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