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· Registered
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I believe the '04 and '05 use the same technology, 6.x, , and the latest version is 6.6- the '06 and up use a different system. They use version 7.x (don't know what version they are up to).

Basically, use the same series, just the newest version for an '05. I have the same system as you and had looked at updating recently.

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