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Content Delivery roles in an upgrade or migration scenario coming from SDL Web 8

If you are upgrading from a fresh installation of SDL Web 8 (that is, not itself upgraded from an SDL Tridion release), the only change introduced in SDL Web 8.5 is the introduction of two new Roles. If you are upgrading from SDL Web 8 which was itself an upgrade from SDL Tridion, you may have performed a minimal upgrade of some or all of your Content Delivery software, and may still need to migrate.