How to Convert a User Mailbox to a Shared in Exchange and Microsoft365?

Convert a user mailbox to a shared mailbox in Exchange and Microsoft 365, follow these steps:

1. Connect to Exchange Online using Remote PowerShell. You will need to have the Exchange Online PowerShell module installed on your computer.
2. Run the following command to convert the user mailbox to a shared mailbox:Set-Mailbox -Identity <UserMailbox> -Type SharedReplace <UserMailbox> with the email address of the user mailbox you want to convert.
3. You can also add members to the shared mailbox by running the following command:Add-MailboxPermission -Identity <SharedMailbox> -User <User> -AccessRights FullAccessReplace <SharedMailbox> with the email address of the shared mailbox you want to add members to, and replace <User> with the email address of the user you want to give full access to the shared mailbox.
4. After converting the user mailbox to a shared mailbox, you can remove the Exchange Online license assigned to the user. This will prevent the user from accessing the mailbox as a user mailbox and ensure that the mailbox is only accessible as a shared mailbox.

Converting a user mailbox to a shared mailbox can be useful in situations where you want multiple users to access the same mailbox without having to share login credentials. Additionally, shared mailboxes do not require a license, so converting a user mailbox to a shared mailbox can help you save on licensing costs.