Microsoft 365

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Outlook 365 – Shared mailbox – Outlook Data File cannot be accessed (0x8004010F) error

To fix this error you must delete the existing OST and NST files, and manually add the shared mailbox Shut down Outlook app. Find the shared mailbox .OST and .NST files. On Windows machines, they are located in C:\Users\<username>\AppData\Local\Microsoft\Outlook Delete both files. Open Outlook app Go to File ->Account Settings -> Account Settings… Select the …

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