I have SharePoint Foundation 2010 installed a server few months back. We were using it for quite some months and it was behaving nicely. But, one fine day when one user tried to access a site on this server, which he was referencing daily, he got an error saying 'The trial period for this product has expired.'. Being an administrator user I am still able to log in to Central administration. But, none of the sites in site collection are accessible.
I was under impression that SharePoint Foundation 2010 is a free product.
Can anybody help me in this regard ?