Using older versions of Outlook for Mac for personal email and calendar
Hello Susan March,
In Legacy Outlook for Mac, please open View > Arrange By > Date Received, then make sure the order is Newest on Top, not Oldest on Top.
If June messages still appear first, clear any active search or filter and check the Inbox again.
Also, Legacy Outlook for Mac will stop working with Exchange Online mailboxes starting in October 2026, so consider switching off the Legacy Outlook toggle once this is resolved.