M365

Office 365 – Convert User Mailbox to Shared Mailbox

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Scenarios are plenty when O365 admins are requested to convert a user mailbox to a shared mailbox.

Here is one that comes up often,

  • User/Employee leaves the organization and others in the team need access to the user’s mailbox to keep track of the project they were working on

When we convert a user mailbox to a shared mailbox, the mailbox must have a license assigned and after the conversion is complete, we can remove the license.

One little caveat to the licensing part is, without license assigned to the shared mailbox, its size is limited to 50GB. So, before converting, make sure to check the mailbox’s size and to increase the shared mailbox’s size to 100GB, assign a Exchange Online Plan 2 license.

Note: If you are on Exchange hybrid environment, you’ll have to manage your mailboxes using on-premises Exchange management tools.

To convert a user mailbox to Shared mailbox using PowerShell

Before proceeding further make sure you are connected to Exchange Online,

$o365cred = Get-Credential
Connect-ExchangeOnline -credential $o365cred

To convert to shared mailbox:

$Mbx = Read-Host "Enter user's email address for Shared Mailbox conversion"
Set-Mailbox -Identity $Mbx -Type Shared
Set-Mailbox

The -Type parameter also supports the below values:

  • Equipment
  • Regular
  • Room
  • Workspace (cloud-only)

Determine if it worked

To make sure the mailbox has been successfully converted:

$sMbx = Read-Host "Enter email address"
Get-Mailbox -Identity $sMbx | fl DisplayName,RecipientTypeDetails
Get-Mailbox

To convert a user mailbox to Shared mailbox using EAC

Exchange admin center also allows converting a user’s mailbox to shared mailbox.

  1. Login to Exchange admin center, in the left navigation menu, click recipients
  2. Click Mailboxes
  3. Search for the mailbox and select it
  4. In the right side details window, Click Convert under Convert to Shared Mailbox
  5. Click Yes in the warning window
Convert to Shared Mailbox
successfully converted to shared mailbox

Determine if it worked

  1. Login to Exchange admin center, in the left navigation menu, click recipients
  2. Click shared
  3. Search for the mailbox
Shared tab in recipients

Hope this post helped you out.

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Office 365 – Update Primary Email Address in Bulk using PowerShell

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In this post, I’ll go over steps on how to update users’ primary email address in bulk.

I had to update the custom domain name address for one of the tenants I manage. When the O365 tenant was setup, I didn’t have my domain name ready for various reasons and the users were setup with @{tenantname}.onmicrosoft.com addresses. Once I added the necessary DNS records for O365 and made sure my new domain name is listed as default in the domain tab(Microsoft 365 admin center -> Settings -> Domains) in the list of , I was ready to update the user accounts with the new domain name.

Before proceeding further make sure you are connected to Exchange Online,

$o365cred = Get-Credential
Connect-ExchangeOnline -credential $o365cred

To bulk update accounts from a csv file:

Note: csv file has User,Emailaddress as column headers. Enter the users’ email address with new domain in the csv file. It is strongly recommended to leave the onmicrosoft.com address in the users’ proxy addresses and specifying the new address as PrimarySmtpAddress with SMTP.

$users = Import-Csv C:\tmp\Update-Email\emails.csv
foreach ($user in $users){

$Mailbox= Get-Mailbox -Identity $user.User
$PrimaryEmail=$Mailbox.PrimarySmtpAddress
$SMTP ="SMTP:"+$user.Emailaddress
Set-Mailbox -Identity $user.User -EmailAddresses $SMTP,$PrimaryEmail -WindowsEmailAddress $user.Emailaddress -MicrosoftOnlineServicesID $user.Emailaddress 

}

To bulk update all accounts in the O365 tenant:

Note: This below script will change all accounts in the tenant from whatever your enter for the $oldDomain to the $newDomain. So, proceed with caution and comply with your change management process and steps.

$oldDomain = Read-Host "Enter existing domain name in '@domainname.com' format"
$newDomain = Read-Host "Enter new domain name in '@domainname.com' format"

$mailboxes = (Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails UserMailbox).where{$_.PrimarySmtpAddress -like "*$oldDomain"}
foreach ($mbx in $mailboxes){

$PrimaryEmail = $mbx.PrimarySmtpAddress
$newSMTPAddress = $mbx.PrimarySmtpAddress -split '@'
$newSMTPAddress = $newSMTPAddress[0] + $newDomain
$SMTP ="SMTP:"+$newSMTPAddress
Write-Host "Processing: $mbx.Name --> $newSMTPAddress"
Set-Mailbox -Identity $mbx.Identity -EmailAddresses $SMTP,$PrimaryEmail -WindowsEmailAddress $newSMTPAddress -MicrosoftOnlineServicesID $newSMTPAddress
}

You can also make this change in bulk in the portal as well,

  1. Select all the users whom you wish you update
  2. Click on Change domains
  3. Select the desired domain name from the drop down at the pop-up window
  4. Click Save changes

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