We are in the process of migrating the SharePoint 2007 contents to SharePoint 2010, using database attach method.
Having installed SharePoint 2010 on the server, upgraded the content database and attached.
It was upgraded successfully and attached however contents are accessible only for the system account. Means that, user whoever has permission on the site are getting access denied error message.
Users are able to access if and only if they are readded again on the site. Even we have granted read access to "nt autherity/authenticated users" before the migration on the site but it failed and the workaround is just to readd the account.
What could the issue? Whenever i try to readd the user name is not getting displayed properly.