msExchHhideFromFddressLists not working or only some of the time

On my hybrid domain sometimes changing msexchhidefromaddresslists to True in ADUC hides the user from the GAL, and other times it doesn’t. Turns out the mailNickName attribute needs to be populated with something for msExchHhideFromFddressLists to be honoured. I just populated it with firstinitial.surname. Waited for a sync and bingo Continue Reading