Post date: Jan 27, 2014 9:47:49 AM
To convert a mailbox to a shared mailbox after the mailbox is transitioned from Exchange to Office 365, follow these steps:
Connect to Exchange Online by using remote PowerShell. See below for more information about how to do this.
Run the following command to set the parameters on the shared mailbox:
Remove the Exchange Online license from the shared mailbox.
Get-Mailbox <primary SMTP address> | Set-Mailbox –ProhibitSendReceiveQuota 10GB –ProhibitSendQuota 9.75GB –IssueWarningQuota 9.5GB –type shared
Connect to Exchange Online
Disconnect from Exchange Online
Open Windows PowerShell.
Run the following command.
$UserCredential = Get-Credential
In the Windows PowerShell Credential Request dialog box, type the user name and password of an account in your Exchange Online organization, and then click OK.
Run the following command.
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Run the following command.
Import-PSSession $Session
Be sure to disconnect the remote PowerShell session when you're finished. If you close the Windows PowerShell window without disconnecting the session, you could use up all the remote PowerShell sessions available to you. You're allowed to have up to three concurrent remote PowerShell sessions. If you use all the sessions available to you, you'll need to wait for the sessions to expire.
After you're finished with your remote Shell session, use the following command to disconnect from Exchange Online.
Remove-PSSession $Session