Microsoft has released a fix for the SP2 problem that reverts the license into a Trial version after installing Service Pack 2.
More details can be found in the following KB article:
971620 - When you install the 2007 Microsoft Office servers Service Pack 2, the product expiration date is activated incorrectly
For your convenience here are the download links for the fix:
[Update June 26th] Additional info from SharePoint Team blog: We will be updating the existing Service Pack 2 download package with a new package that includes this fix within the next 4-6 weeks.
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if we us the hotfix KB971620, are we need to key in the VLK ?
It should not be necessary.
I tried to install the Hotfix and I still see the trial version on my license page. Any suggestions?
I would suggest to enter the license key again to resolve this.