Convert mail enabled security group to shared mailbox

A nice question!

Converting a mail-enabled security group to a shared mailbox is a bit of a process, but it's doable. Here's a step-by-step guide to help you achieve this:

Prerequisites:

  1. The security group must be mail-enabled, meaning it has a valid email address and is configured to receive emails.
  2. You have the necessary permissions to manage the security group and shared mailboxes in your organization.

Step 1: Remove the security group's email address

  1. Open the Exchange Management Console (EMC) or Exchange Admin Center (EAC).
  2. Navigate to the "Recipient Configuration" or "Mailboxes" section.
  3. Find the security group you want to convert and right-click on it.
  4. Select "Properties" and then click on the "Email Addresses" tab.
  5. Remove the email address associated with the security group.

Step 2: Create a new shared mailbox

  1. In the EMC or EAC, navigate to the "Mailboxes" section.
  2. Click on "New Mailbox" and select "Shared Mailbox" as the mailbox type.
  3. Fill in the required information, such as the mailbox name, display name, and email address.
  4. Set the "Mailbox type" to "Shared" and select the desired storage quota.

Step 3: Move the security group's membership to the new shared mailbox

  1. In the EMC or EAC, navigate to the "Groups" section.
  2. Find the security group you want to convert and right-click on it.
  3. Select "Properties" and then click on the "Members" tab.
  4. Select all the members of the security group and click "Remove".
  5. In the "Members" tab, click "Add" and select the new shared mailbox you created in Step 2.
  6. Add the members you removed in Step 4 back to the shared mailbox.

Step 4: Update the shared mailbox's permissions

  1. In the EMC or EAC, navigate to the "Mailboxes" section.
  2. Find the shared mailbox you created in Step 2 and right-click on it.
  3. Select "Properties" and then click on the "Permissions" tab.
  4. Update the permissions to reflect the desired access levels for the shared mailbox.

Step 5: Verify the conversion

  1. Send an email to the shared mailbox's email address to verify that it's working correctly.
  2. Check the shared mailbox's properties to ensure that the membership and permissions are correct.

That's it! You have successfully converted a mail-enabled security group to a shared mailbox.