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> The question is whether Microsoft's products add real value to their customers.

I'm pretty sure Outlook convincing me not to read corporate mail was not of value to my employer (Microsoft's customer). At the very least, it added confusion and delay when other employees expected me to see things they emailed. Perhaps letting me focus on other stuff was of benefit to the employer, but that's tricky to measure; it's hard to imagine employers want to use a terrible email system to subtly discourage email use, there are more effective ways.