Outlook client prompts' Outlook 2016 upgrade in progress' when using it. The client cannot send and receive emails normally. Find the cause and solution

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2025-03-11T07:47:03.5066667+00:00

The Outlook 2016 client is unable to send and receive emails, prompting "Upgrade is in progress, mailbox is being optimized as part of Outlook 2016 upgrade, this one-time process may take more than 15 minutes, which may affect performance during optimization", and cannot be successfully upgraded, causing mailbox to be unusable. Multiple users in the company are experiencing this situation. What causes it and how to solve it

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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