Configuring preferences and options in Outlook on the web for business
2 user mailboxes involved in this test:
Edge version 97.0.1072.69 (Official build) (64-bit)
Firefox version 96.x
They are accessed through 2 different Windows PCs. Both browsers are showing the same behavior. OWA doesn't remember previously typed-in addresses (for a long time). It seems to remember them only for a few minutes. Once again, both browsers cache are not cleared manually or when exiting.