The German Dreckstool website (meaning shit tool) hosts a hitlist of shitty tools/software. I don't think it's that popular, but the top/high-scored of the list may be indicative of some of the worst.
Outlook should be way higher. I cannot believe how in tarnation I cannot view the reply they gave me if I'm standing in my sent folder. I have to copy past the subject and searchthe mail again on my inbox. And the ficking alerts that don't trigger at friggin all WTF?
Old outlook had a setting to place sent emails next to the replied to email. That worked for all folders, except the inbox.
In Thunderbird I let it place sent emails always next to the context.
In the new Outlook, after every send, I have to go into sent and move it to the correct folder. (I have many folders for structure of various concerns.)
I googled nr. 1 and watched their promotional video.
Sooooo many buzzwords. From their marketing material, I have literally no idea what the software even does, but I can already tell it's utter shit.