Need to Update Outlook account

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Hi @Janice DQA 
Thank you for contacting the Microsoft Q&A forum. 

Based on your description and my research, it appears that your Outlook requires an update to function properly. 
To better understand your situation, could you confirm whether your Outlook version is Outlook 2016 MSI? 

If that is the case, Outlook version 16.0.4266.1001, which is lower than version 16.0.4600.1000, does not support connecting to Exchange Online. This is mentioned in the following document: New minimum Outlook for Windows version requirements for Microsoft 365 | Microsoft Community Hub   

To update Outlook 2016 MSI to the latest version, you can install the July 1, 2025, update for Outlook 2016 (KB5002747) - Microsoft Support, you may try the following approach: 

For reference, here are forum posts from users with similar issues who confirmed that updating through Windows Update resolved the issue: 

• how to fix this error outlook required version 16.0.4600.1000 - Microsoft Q&A
• Outlook requires updates before it can start - Microsoft Q&A   

I hope this helps. Please feel free to reach out if you have any updates or need further assistance. 

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