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ComotoJC's avatar
ComotoJC
Brass Contributor
Oct 29, 2019
Solved

"Outlook data file cannot be accessed" when trying to send from shared mailbox?

We are using shared mailboxes for several purposes, but getting erratic behavior.  Latest is error when trying to send from Windows Outlook clients.  Mailboxes are configured in Outlook as an accou...
  • Codewriter93's avatar
    Oct 31, 2019

    ComotoJC, I was able to fix one of my shared email accounts that had the same issues as you describe. I thought I share what worked for me.  I compared the shared mailbox that was not working to a second working shared mailbox and noticed that the working mailbox has two data files compared to the one with the broken mailbox. One is the standard OST, and the second is an NST. After reading this post-https://www.systoolsgroup.com/nst/, I determined it must be the issue. 

     

    My fix was to remove the broken shared mailbox from Outlook and add it back.  It took Office365 thirty plus minutes to sync up and recreate the data files. Once the sync completed, the broken shared mailbox now had the two data files, and I was able to send an email as the shared mailbox account name.

     

    BTW: Outlook did an automatic restart when it completed the synchronization.

     

    Hope this helps.

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