We had a password change rule at a company I worked at because QuickBooks required it. Because QuickBooks required it upper-management decided that ALL other passwords were required to be changed as well (email and desktop passwords, for most employees).
Because time is money, and the employees' time was all chargeable at about $250/hour, the IT guy was tasked with the job of changing everyone's password himself right before the 90 days were up. He just kept everyone's passwords in a password manager, and the "Notes" field contained the password change pattern the user wanted to follow.
Being the IT guy's manager I was able to exclude myself from these crazy shenanigans, but no one else was so lucky. In fact, many people asked for their passwords to be synced by the IT guy for other services they use at work!
Because time is money, and the employees' time was all chargeable at about $250/hour, the IT guy was tasked with the job of changing everyone's password himself right before the 90 days were up. He just kept everyone's passwords in a password manager, and the "Notes" field contained the password change pattern the user wanted to follow.
Being the IT guy's manager I was able to exclude myself from these crazy shenanigans, but no one else was so lucky. In fact, many people asked for their passwords to be synced by the IT guy for other services they use at work!