[horde] Upgrade of Horde from V. 3 to V. 5 failed

[Me]

>Actually you probably had users logging in with different spellings of 
>their usernames. You authentication backend might be case insensitive, 
>but Horde ist not. Unfortunately the index key from InnoDB tables are 
>case insensitive again, which gets you the errors from horde-db-migrate.
>You need to fix your user names in the old Horde tables first, 
>normalizing them to all lower-case.

Hi Jon,
that somewhat worked, I did change capital names and after running database upgrade command, some calendar events showed up. I am still having some issues and I will need to spend more time digging around.
Why is Horde case sensitive? Most systems are not and that can be an issue. Especially with mobile devices and auto correct. My email address is my name. So when I try to log in to horde from my phone, I type a name: john, but auto correct changes it to John. It will allow me to log in, but I will have issues with database. This is a very bad design in Horde.