Using older versions of Outlook for Mac for personal email and calendar
I must be lucky - sort of!
I have several folders displaying all of its emails and some are over 3 years old.
I have one folder containing emails upto 1 year old but an additional email 2 years old isn't displayed.
I have one folder which I know contains 38 emails but only 22 emails are displayed and they are over 2 years old.
Every so often the Inbox displays emails with no preview, just the header, and the body will not download unless it is moved to another folder or deleted!
Edit 10/9/22: This 'NEW' version for Macs is now three years old and still doesn't function properly. Microsoft don't seem to care so I am reverting to the Legacy version for now and when that ceases I shall move to a different email client provider and cancel my subscription.