To convert a shared mailbox into a regular user mailbox in Microsoft 365, follow these steps:
Using the Exchange Admin Center (EAC):
Access the Exchange Admin Center:
Sign in to the Microsoft 365 admin center.
In the left-hand navigation pane, select "Show all" to expand the menu.
Click on "Exchange" to open the Exchange Admin Center.
Locate the Shared Mailbox:
In the EAC, navigate to "Recipients" > "Shared".
Browse or search for the shared mailbox you intend to convert.
Initiate the Conversion:
Select the desired shared mailbox.
In the right-hand pane, click on "Convert to regular mailbox".
Confirm the action when prompted by clicking "Yes".
Assign a License:
After the conversion, navigate back to the Microsoft 365 admin center.
Go to "Users" > "Active users".
Find and select the newly converted user mailbox.
Click on "Licenses and apps".
Assign the appropriate license that includes Exchange Online.
Click "Save changes" to apply the license.
By following these steps, you can effectively convert a shared mailbox into a user mailbox in Microsoft 365, ensuring seamless access and functionality for the designated user.
Reference this article for more information.