Using classic Outlook for Windows in business environments
... By the way, I forgot to ask "What is the exact version number of your Outlook 2016"? ...
When affected users reply in this thread it might be helpful if they could include their Windows version and build (go to Settings | System | About | Windows Specifications, or open a Run dialog box and enter winver) as well as the full name of their Office product (e.g., MS Office Home and Business 2019 Click-to-Run) and Office version and build number shown beside the "About Outlook" button at File | Office Account | Product Information as shown below. Note that the Office build number shown beside the "About Outlook" button is different from the build number displayed when you click that button.
If you have a retail version of MS Office Click-to-Run (C2R) then the version and build number shown beside the "About Outlook" button should match one of the recent version and build numbers documented in the update history for Office 2016 C2R and 2019 C2R at https://learn.microsoft.com/en-us/officeupdates/update-history-office-2019#retail-versions-of-office-2016-c2r-and-office-2019 or the update history for Office 2021 C2R at https://learn.microsoft.com/en-us/officeupdates/update-history-office-2021#retail-versions-of-office-2021.
Dell Inspiron 5584 * 64-bit Win 10 Pro v22H2 build 19045.3208 * Firefox v115.0.2 * Microsoft Defender v4.18.23050.5-1.1.23060.1005 * Malwarebytes Premium v4.5.33.272-1.0.2069 * Macrium Reflect Free v8.0.7279 * Microsoft Office 2019 Home and Business 2019 Version 2306 / Build 16529.20182 C2R