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I'm just trying to confirm that the following statements are correct:

Exchange 2003 had mixed/native modes: Mixed kept the system backwards compatible with Exchange 5.5 (or earlier). Native mode lost that compatibility, but would work with 2000+.

Exchange 2007 & 2010 have no concept of Mixed/Native modes and are not compatible with Exchange 5.5 (or earlier).

To my knowledge these statements are correct. If I am wrong could someone point me in the correct direction?

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up vote 1 down vote accepted

You pretty much are right. 2007 was a significant step forward architecturally. Coexistence with the old systems was not really an option.

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