Not all of them, most of ATC in EASA airspace is Linux based and use electronic strips instead of the plastic paper strips.
But the foundation of the ground/ground communication is still AFTN based on x400 network (Europe used to have an X.25 network for its CIDIN communications).
The latest and newest tech for international data exchange is AMHS based on X400, often it is x400 over IP ok, but still a 50 years or so tech.
The main idea behind ATC and aviation tech is reliability and compatibility with countries with less money to upgrade tech.
Not all of them, most of ATC in EASA airspace is Linux based and use electronic strips instead of the plastic paper strips.
But the foundation of the ground/ground communication is still AFTN based on x400 network (Europe used to have an X.25 network for its CIDIN communications).
The latest and newest tech for international data exchange is AMHS based on X400, often it is x400 over IP ok, but still a 50 years or so tech.
The main idea behind ATC and aviation tech is reliability and compatibility with countries with less money to upgrade tech.