Windows

You likely have a supported Microsoft 365 account if you can log into Microsoft Support.
The free version of New Outlook does not work offline, nor does it support POP.
OlympusNet does not support New Outlook.

Before calling OlympusNet it would be helpful to know if you’re using New Outlook or Classic Outlook.
Open Outlook and let us know which of the following windows you see …
OR

A helpful reference is What version of Outlook do I have?