Ask HN: What is the worst software you are forced to use?

at work, i am forced to use ring central. i cannot tell you the pain and frustration of having to fight with something constantly in order to use it. everyday i find more and more bugs with this POS. it's gotten to the point where i think i'm going to just uninstall the software after i forward my phone to my cellphone. i highly recommend anyone considering a voip provider to use anyone else besides them.

what are some software that you are forced to use and that want to warn others to avoid?