Any corporate VPN. Hipchat. Outlook. Windows. Any printer software which contains anything apart from basic driver itself. Firmware update tools. System update tools.
That's just from today and I haven't even had lunch yet...
Skype for business.
Because I need a VM to have it running on linux.
The quality is even worst than the skype for individuals.
The web client is useless (no video, no audio. based on User-Agent)
Their is no fallback on phone.
The android client won't connect you if you didn't give your phone number.
By default you can't see your full company directory in your contact
You can apply most of this to office365.
Excluding that the web clients are not that bad (if you forget about live edit, and phone client)
Outlook too. filtering your mail without telling you. Creating folder without your agreement
That's just from today and I haven't even had lunch yet...