I came to work this morning and found complains from a number of my users who could not utilize Search functionality in SharePoint 2007 instead they will get this error: "Your licence for Office servers Search has expired".
Quickly to diagonize the issue I browsed into my central administration. Click on Operations -> then Convert License Type under upgrade and Migration. Well, if you see this "Office SharePoint Server Trial with Enterprise Client Access License" on current License area. You probably installed SharePoint 2007 Service Pack 2, described in the KB here: http://support.microsoft.com/default.aspx/kb/971620.
Now what you need to do is to input the valid license click on OK. Then reset iis on all the web servers. See this blog for details http://blog.laksha.net/2009/12/sharepoint-your-licence-for-office.html. Then you good to go.