The Sign In and Sign Out pages may now be customized in the Quick Layout Spreadsheet. Additional functionality allows the login and logout code to be customized.
The Sign In and Sign Out pages are replaced with new versions. The SignIn_controls.ascx control and corresponding SignIn_Controls.Control.cs (.vb) code files are deleted.
After migration, re-apply any customizations you may have made to the original Sign In and Sign Out files to the new Sign In and Sign Out files in your application.
Version 6.2 Application Migration