A Minecraft Realms integration update and Realms invites.
Please make sure that you are in the correct server mode (online mode/offline mode) when you start the 1.8.9 server for the first time, because profiles are not compatible between these two server modes.
Cross-platform server jar:
Cross-platform server windows exe: https://s3.amazonaws.com/Minecraft.Download/versions/1.8.9/minecraft_server.1.8.9.exe
Credits: Mojang Team