I would rate the stability as eight out of ten.

SonicWall Email Security is stable.

The solution is reliable and stable. It may be a little behind Barracuda but we haven't had any problems. 

We haven’t come across system downtime.

It is quite a stable solution. I rate its stability as a nine.

The solution is stable, but it does have room for improvement.

The stability is not 100%. I would say that it is better than okay, but it can still be improved in terms of monitoring. There are some glitches that happened, although we were able to fix them.

SonicWall Email Security is a stable product.