Eclipse Java EE: Difference between R and M1 packages

Question

I want to install Eclipse IDE for Java EE Developers and stumbled upon

eclipse-jee-mars-R-linux-gtk-x86_64.tar.gz

and

eclipse-jee-mars-M1-linux-gtk-x86_64.tar.gz.

Both for Linux 64bit. What is the difference between those packages?

Answer 1

The 'M1' release is an old Milestone 1 release of Eclipse Mars, this is completely obsolete and should not be used.

The 'R' release is the actual release of Mars.

Stick to the downloads shown on https://www.eclipse.org/downloads/