The user mailbox youre converting needs a license assigned to it before you convert it to a shared mailbox. If youve removed the license add it back so you can convert the mailbox.

Convert User Mailbox To Shared Mailbox In Exchange Hybrid Ali Tajran
Click on the Active Users option.

Convert user to shared mailbox office 365. The script can be used in business rules custom commands and scheduled tasks to convert a Microsoft 365 Office 365 user mailbox to a room or equipment mailbox. Enter a name for the shared mailbox. The Office 365 Admin Center window will get open.
In my account for some reason the option to convert to a shared mailbox was only available for cloud accounts not ones synced with AD. The other way is to convert the user mailbox to shared mailbox with PowerShell. To convert from regular to shared mailbox click Convert to shared mailbox and then click Confirm.
So I disabled the user account in local AD forced a sync with Azure AD then used Powershell to change the type to a shared mailbox. In the admin center go to the Groups Shared mailboxes page. Now click on Convert to shared mailbox option to convert it to shared mailbox.
See Convert a user mailbox to a shared mailbox. Microsoft will ask for confirmation click on the yes button. The script can be used for cloud mailboxes only not for remote mailboxes.
The Office 365 Admin Center window will appear. For room mailboxes you can enable the associated user account which also requires you to specify a password which requires the Reset Password role. Click on Admin option at the opened interface.
The properties page is displayed. Now go to Recipients Shared Shared mailbox and then click on convert. Otherwise you wont see the option to convert the mailbox.
To convert a regular mailbox with assigned license in Office 365 to a shared mailbox perform the following necessary steps. Convert to mailbox shared mailbox Remove 365 licence Delete from AD in the 365 admin portal restore user from the Deleted Users This restores the shared mailbox to 365 only without the user in AD. In Exchange 2010 its only possible to do it with PowerShell.
Select the user mailbox for conversion from the list and click the Mail Settings option. When you convert a regular user mailbox to a room equipment or shared mailbox the associated account is disabled. Choose the user mailbox which you want to convert to the shared mailbox.
Login to Office 365 with an administrator account then go to Microsoft 365 Admin centre and then select Exchange. So if you already have removed the license then add it back so that you can convert the user mailbox. After converting the mailbox to a shared one you can remove the license from the users account.
Under More actions do the following. Select a mailbox that you want to convert and click the display name. Then the wizard chooses the email address but you can edit it.
You can convert user mailboxes to shared mailboxes. In Exchange 2010 we utilized online archives and we are doing the same in 365. Or else you will not get an option to convert the mailbox.
To create a shared mailbox you need to subscribe to a Microsoft 365 for business plan that includes email. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58. Converting a 365 Mailbox with an Archive to a Shared Mailbox without losing the archive - need a better way We are just a couple of months into a migration from Exchange 2010 to Office 365.
On the Shared mailboxes page select Add a mailbox. Convert user mailbox to a resource mailbox in Exchange Online. Log in to your Office 365 accounts with proper Global Administrator details.
2 found this helpful. Its possible to convert the user mailbox to shared mailbox in a couple of ways. In the Microsoft 365 admin center choose the Active users option.
Convert User Mailbox to Shared Mailbox in Office 365 If you want to convert a regular mailbox to Office 365 shared mailbox with allotted license follow these steps. Users with global admin or Exchange admin roles can create shared mailboxes. Login to your Office 365 account with the global administrator credentials.
One of them is in the Exchange Admin Center. The user mailbox you are going to convert requires an Office 365 license assigned before converting into a shared mailbox.

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