Upgrading Sitecore 5.x to SC5.3

For upgrading a Sitecore solution from any version except Sitecore 5.3 Release Candidate users should use the Migration Wizard:

The Migration Wizard allows to transfer data from the following releases of Sitecore: 4.3.2.x, 5.0.x, 5.1.x, 5.2.x.

For instructions on how to upgrade previous revisions of Sitecore CMS V5.3 to the latest version, please follow the link below: