First it was Visual Studio, second CodeWarrior and then obviously Eclipse (I probably never used the latter, jumped ship a couple of years before the infamous burning platform.) So every 3-5 years they changed the development environment. Can probably also seen as a sign that Symbian development was tedious and not much fun.

That was Carbide IIRC: https://en.wikipedia.org/wiki/Carbide.c%2B%2B

You could always tell who was using it in the office because their laptop fans would be at full blast.