SharePoint 2010 pre-RTM to RTM is not supported.
While listening to a Webcast from Jon Quist discussing preparing customers for upgrading to SharePoint 2010 he made an interesting announcement. He explicitly saying that not only was pre-RTM to RTM upgrades not supported but that it would actually be flagged to PREVENT such an upgrade.
So use pre-RTM with caution, and don’t do anything on pre-RTM that you cannot afford to lose. We had a vague reference to SharePoint 2010 pre-RTM not upgrading to RTM in a blog post from Jei Li some time ago, but it was assumed there would still be a way to move content even in an unsupported manner to RTM. However, that seems to not be the case.
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