Using older versions of Outlook for Mac for personal email and calendar
Hi John.Ts,
Thank you for choosing Microsoft community.
Regarding your concern, please first check if the issue exists on the Outlook on the Web (outlook.office.com). If the issue doesn't exist, re-check if the emails have been fully synced to your Outlook for Mac desktop client.
If the issue persists on the Outlook on the Web, kindly check the following aspects.
- If there's any inbox rule set up to move certain messages to certain folders. See Create a rule in Outlook for Mac (microsoft.com).
- If your organization IT admin or Microsoft 365 admin has configured related retention policies or using Online Archive to move messages which were over certain period of time. See Create and configure retention policies to automatically retain or delete content - Microsoft 365 Compliance | Microsoft Docs & Use your online archive with Outlook for Mac (microsoft.com).
Hope it helps! If any update, welcome to share with us.
Thanks & Stay safe,
Qian