Hi,
Sorry, the wording was a bit ambiguous. Is your mail server is on-premise server or cloud Outlook online?
As GetIMAPMailMessage activity communicate with mail server directly, it doesn’t use Outlook.
So if your mail server support IMAP, it might be available.
If you use Outlook online(Outlook web)(Outlook 365 web), we might be able to use UseOutlook365 activity (or MicrosfotOffice365.activities package)
Or if you have something trouble with GetOutlookMailMessage, the above UseDesktopOutlookApp and GetEmail might work.
Regards,