I was at a company acquired by IBM, and left within two years. When asked by HR at my exit interview why I was leaving I honestly answered "Lotus Notes".

My reasoning (which I ranted on extensively for the rest of the interview) was that mandating Lotus Notes as a tool internally, let alone continuing to sell it, reflected very poorly on how IBM felt about their employees, customers, and products. Examples:

* for YEARS IBM had to ship a "killnotes.exe" utility to their own employees because they couldn't figure out how to gracefully exit the app - and that's just one papercut out of hundreds;

* they misrepresented the popularity of the product, as the number of seats sold was tied to other bundled deals - most customers wouldn't touch the product;

* they continually gaslit employees and customers that Notes was great for common workflows (email in particular, searching in general) where in fact it was overwhelmingly a failure - and anyone who complained "didn't understand the product";

* they would send out multiple-choice surveys on "How would you like to improve Notes?" with every question and possible answer tied to developer-focused and database features with nothing allowing feedback on the primary use-cases that were driving users up the wall

In the end IBM's stance on Notes was either tone-deaf, incompetent, mendacious, malicious, opportunistic, extractive, callous, or shameless with no sense of pride in product.

I'm still bitter. Man, I hated that product.