Script to add first.last@domain.com to exisiting Office 365 setup

Hi Noel,

I find a CSV file to be the easiest way to make sure I have the addresses correct, rather than finding out later i had an error in my script trying to do the names programmatically.

If you are just adding a new proxy email address (rather than changing the primary, if you want to change the primary, read further down) all the csv file needs is username and emailaddress

username,emailaddress

john.smith,john.smith@domain.com

sally.smith,sally.smith@domain.com

The basic process here is

Connect to exchange online via PowerShell

# connect to office 365 exchange online
$creds = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $creds -Authentication Basic -AllowRedirection

# import session
Import-PSSession $session

Then we can import the csv and use the Set-Mailbox cmdlet using the add syntax like this

#import csv file
$csv = import-csv 'C:\temp\users.csv'

# Add additional email address to each user
$csv | foreach {set-mailbox -identity $_.username -emailaddresses @{add="$_.emailaddress"}

If you are changing the primary SMTP address

I would take a look at this script by Paul Cunningham

https://gallery.technet.microsoft.com/office/Bulk-Add-SMTP-Addresses-to-e3d28842

Good luck!

Liam