How to change the existing Window Membership Provider to Claims Based Authentication in SharePoint 2010?
$WebAppName = "http://yourWebAppUrl" $wa = get-SPWebApplication $WebAppName $wa.UseClaimsAuthentication = $true $wa.Update() $account = "yourDomain\yourUser" $account = (New-SPClaimsPrincipal -identity $account -identitytype 1).ToEncodedString() $wa = get-SPWebApplication $WebAppName $zp = $wa.ZonePolicies("Default") $p = $zp.Add($account,"PSPolicy") $fc=$wa.PolicyRoles.GetSpecialRole("FullControl") $p.PolicyRoleBindings.Add($fc) $wa.Update() $wa.MigrateUsers($true) $wa.ProvisionGlobally() Source : http://technet.microsoft.com/en-us/library/gg251985.aspx Extend a Web application that uses Windows-claims authentication (SharePoint Server 2010)