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    19 comments  ·  Office 365 Admin » Exchange Admin  ·  Flag idea as inappropriate…  ·  Admin →
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    Ytsejamer1 commented  · 

    One way after converting the O365 User Mailbox to a Shared Mailbox in your O365 portal is to revisit the AD account and go into the attributes for the mailbox user.

    Now update the following attributes with these values:

    msExchRemoteRecipientType: 100
    msExchRecipientTypeDetails: 34359738368

    That will switch it on your on-prem directory, which will then sync out to O365. Then your management utilities will show the correct mailbox type.

    Found that here:

    As always, be very careful when hacking around with AD attributes.

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