I was the test subject for this function at our firm. We recently migrated our company to Office 365 with online Exchange. Enabled the archive feature only for myself. I don't think our users will find it beneficial, it's irritating looking for older emails in a separate place, and it delays going in and actually cleaning them out. It would take a specific kind of user to benefit from this feature. Not our users.
So - I want to turn this feature off. I've only found articles that tell me I will lose all those emails if I don't perform some complicated .pst file copy over and import, etc. The emails are in many folders with subfolders. I just want them back in those same folders in my main Inbox. Is there a way for this? Grateful for some help.