Just saw on the Microsoft SharePoint Team blog that SharePoint 2007 Service Pack 2 contains a bug that activates a 'trial-mode' counter that will cause your SharePoint sites to expire after 180 days, just like an evaluation copy would.
There is no risk to data or system configuration or to any custom code, but your SharePoint servers will become inaccessible after the 180 day mark.
The products that this affects include Office SharePoint Server 2007, Form Server 2007, Search Server 2008 and Search Server 2008 Express. Windows SharePoint Services 3.0 in not affected.
Microsoft is working on a hotfix, which will be identified by KB article 971620. It is not currently available.
