At least it is able to move almost all my e-mails to spam folder (where they are deleted after a month), without any way to disable this "feature" except by slowly whitelisting senders.
Another great "feature" is that if you have accounts on two different organizations, it seems to be impossible to logon to the other account even after signing out from the first account, unless you use private mode on the browser.
Mailbox/retention policies can be tweaked, as well as mail flow ones by your administrator. With that said, depending on the combination of other antimalware/antispam apps that your company uses and Microsoft being quite pushy about their antispam for some reason, even that may not be a perfect solution.
