Earlier quoted context omitted.
Meetings != Communication (always avoid double negations)
Except (No Meetings != No Communication) != (Meetings != Communication)
This becomes apparent when you create a truth table for it:
!meetings != !communication
meetings | communication | expr
F | F | F
T | T | F
T | F | T
F | T | T
This is the same truth table one would get with "meetings != communication" so they should be logically equivalent.