Onboarding alone is enough for plenty of hate. What feels like half a dozen competing SSO systems trying to highjack the funnel, each of them gimped by two other internal Microsoft factions trying to shove in their upselling path. And of course with a Byzantine form flow through the full set of desktop client, OS-level Windows user identity management and multiple browsers (system default, Edge, and iirc occasionally even that pre-webkit edge, perhaps popping up because of some activeX zombie). I recently had the pleasure of participating in a one-off teams call (project handover to an external consultant), from a company network that runs on Microsoft but without 365 and no routine Teams usage outside of some unrelated division, with a non-Microsoft browser as the system default. A day to remember. Spent hours between the onboarding labyrinth and a pre-existing private account that was almost but not quite accepted by the Microsoft maze, before I eventually got in dusting off some ancient Skype account. Yeah, that Skype, the one I stopped using around the time I quit ICQ.