Office 365 Shared Mailbox keep Stopping

Faraz Akhtar 1 Reputation point

I have created 5 Shared mailbox in office 365 , and account added to client outlook , user can send and receive email for 1 day or for some time.

BUT Next day or after few hours, client can't open 1, or 2, out of 5 shared mailbox.


Error is - Cannot expand the folder.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Jayce Yang-MSFT 1,251 Reputation points Microsoft Vendor

    How did you add these shared mailboxes, automapping with full access permission?
    Did it work fine before? Sorry, your screenshot is not uploaded successfully, could you upload it again?

    Based on my experience, this issue may be caused by Outlook client, you could test in OWA and check if this issue persist.
    In addition, does this issue occur on other users? This can help us isolate whether this issue is about your mailbox.

    As we know, when you have many shared folders or mailboxes open, you may experience slow performance event get errors. So could you please test to reduce the number of shared folders or mailboxes that you have open in Outlook. For Office 365 mailboxes, we could use SARA tool to troubleshoot the Outlook client issues.
    Support and Recovery Assistant is a new tool that helps users troubleshoot and fix issues with various Office 365 apps and services. The app diagnoses common Outlook issues like account setup, connectivity issues, password issues, or Outlook stops responding or crashes.

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