Questo il testo ufficiale del comunicato rilasciato sul blog del gruppo di 
sviluppo di Sharepoint
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We take product quality seriously and make every effort to avoid and resolve 
issues that adversely impact our customers.  Unfortunately, we have recently 
discovered a bug with Service Pack 2 (SP2) that affects all customers that 
have deployed it for SharePoint Server 2007.
During the installation of SP2, a product expiration date is improperly 
activated. This means SharePoint will expire as though it was a trial 
installation 180 days after SP2 is deployed. The activation of the 
expiration date will not affect the normal function of SharePoint up until 
the expiration date passes. Furthermore, product expiration 180 days after 
SP2 installation will not affect customer's data, configuration or 
application code but will render SharePoint inaccessible for end-users.
We are working to release a hotfix to automatically fix this issue. A manual 
work-around is currently available and involves customers re-entering their 
Product ID number (PID) on the Convert License Type page in Central 
Administration.  For more information and detailed steps please read this KB 
article<http://support.microsoft.com/kb/971620>. (The KB link is not 
currently active, it will be available within the next 48hrs)
We apologize for any inconvenience this issue may cause you.
Jeff Teper
Corporate Vice President
SharePoint.
Q&A
Which products are affected by this?
Applying Service Pack 2 to any of the following products will result in this 
issue: Office SharePoint Server 2007, Project Server 2007, Form Server 2007, 
Search Server 2008 and Search Server 2008 Express.
Windows SharePoint Services 3.0 is not affected by this issue.
What can I do to fix it?
To work around this issue customers will need to re-enter their Product ID 
numbers (PID) on the Convert License Type page in Central Administration. 
Please see this KB article<http://support.microsoft.com/kb/971620> for 
detailed steps. (The KB link is not currently active, it will be available 
within the next 48hrs)
Customers can also wait for the hotfix (available for free from 
http://support.microsoft.com) to resolve this issue.
Product ID numbers (PIDs) can be retrieved by logging into the Volume 
Licensing Service 
Center<https://www.microsoft.com/licensing/servicecenter/Home.aspx?lc=1033>.
Note: For Search Server 2008 Express the only way to resolve this issue is 
to apply the hotfix.
What is Microsoft doing to fix it?
Microsoft is working on a hotfix and public update for the product. We will 
update this blog post with details and a link to the hotfix as soon as it is 
available.
Do I need to update all of the servers in my farm?
No. The Product ID number only needs to be entered once.
What if I haven't installed SP2 yet but want to? What should I do?
You can continue to plan for and install Service Pack 2 for SharePoint 
Server 2007 with the additional step of re-entering your Product ID number 
after the installation is complete by following the instructions in this KB 
article<http://support.microsoft.com/kb/971620>. (The KB link is not 
currently active, it will be available within the next 48hrs)
Does this issue impact anything else?
The issue only activates the product expiration date. The activation of the 
expiration date does not affect the normal function of SharePoint up until 
the expiration date passes, at which point SharePoint will be inaccessible 
for end-users. This issue does not affect customer's data, configuration or 
application code.
I can't find/don't know my original PID, where can I find it?
Product ID numbers (PIDs) can be retrieved by logging into the Volume 
Licensing Service 
Center<https://www.microsoft.com/licensing/servicecenter/Home.aspx?lc=1033>.