Sometimes things just don’t go according to plan. It looks like SharePoint’s latest service pack has a 180 day timebomb in it. There’s a patch coming, and the workaround is pretty easy – you just enter your key again.
I feel sorry for the SharePoint dev team – they do such a good job, but people often remember the things that do not go so well… Hopefully this one will be quickly fixed and just as quickly forgotten… At least it does not affect people immediately.
More details can be found here – http://blogs.msdn.com/sharepoint/archive/2009/05/21/attention-important-information-on-service-pack-2.aspx
UPDATE: There’s a hotfix available to fix it now. check it out here – http://support.microsoft.com/default.aspx?scid=kb;EN-US;971620