I was just on the Celebration May 18-26. May 24 I received an approval prompt from hotmail where you pick one of three provided 2 digit numbers and approve or deny a new login from an unknown location.
This was shortly after using the ships wifi and my purchased premium plan to check my email.
I denied the login and was confused so I checked my attempted logins and sure enough someone was able to log in using my actual hotmail password, which by the way is a google suggested password, nearly impossible to guess.
The login location was somewhere in lithuania so I assume they used a VPN.
So pretty obvious someone on the ship was using a sniffer.
Be aware and be safe.