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?