I thought the MSI SDK has pretty clear guidelines about when the 
ProductCode and UpgradeCode should change.

DONG LEE wrote:
> By browsing through the wix newsgroup, I've seen in multiple occasions that
> people say it is recommended to
> use different ProductCode GUIDs for packages targeted for different
> architectures, and even the UpdadeCode.
> What is the reason for that? I am building x86 and x64 packages with the
> same wix source code, but they have
> the same product and upgrade codes now. So I wanted to find out why the
> practice is recommended before making
> changes to my code. Thanks!
> ------------------------------------------------------------------------------
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------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing 
server and web deployment.
http://p.sf.net/sfu/businessobjects
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