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How to Convert a User Mailbox to a Shared Mailbox

Written May 2018. Microsoft changes these admin screens often, so the screenshots below may not match what you see today. The sequence of steps is usually still correct — if something looks wrong, tell us and we'll update it.

Convert a User Mailbox to a Shared Mailbox

  1. Go to the Office 365 Admin Center.
  2. On the Active users page, select the user whose mailbox you want to convert.
  3. On the user's page, expand Mail Settings and click Convert to shared mailbox. You won't see this option if the user doesn't have an Office 365 license assigned to them. Go assign them a license then come back to this step. 
  4. Click Convert to complete the conversion.

Reference Link: https://support.office.com/en-us/article/convert-a-user-mailbox-to-a-shared-mailbox-2e122487-e1f5-4f26-ba41-5689249d93ba

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