Do officers still salute when entering a fellow officer's office
In my time we did, but only if wearing a hat.
Outdoors, I always saluted female officers irrespective of their rank, even if they were below me.
I was taught it back in 1965, and was told it was the equivalent of doffing ones' hat to a lady in the civilian world.
Quite a few junior female officers were surprised that I did it, but all thought it a nice gesture.
I doubt that happens now.