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PowerShell Exchange Online Commands

This guide provides essential commands for managing Exchange Online using the ExchangeOnlineManagement module.

Parent Topic: PowerShell Comprehensive Guide

1. Connecting to Exchange Online

First, ensure the module is installed:

Install-Module -Name ExchangeOnlineManagement -Scope CurrentUser

Then, connect to your tenant. This will prompt for modern authentication (MFA).

Connect-ExchangeOnline -UserPrincipalName "admin@yourdomain.com"

To disconnect when you are finished:

Disconnect-ExchangeOnline

2. Mailbox Management

Find Mailboxes

# Get a specific mailbox
Get-Mailbox -Identity "user@yourdomain.com"

# Get all user mailboxes
Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails UserMailbox

# Get all shared mailboxes
Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails SharedMailbox

Mailbox Permissions

# Grant Full Access permission
Add-MailboxPermission -Identity "shared.mailbox@yourdomain.com" -User "user@yourdomain.com" -AccessRights FullAccess -InheritanceType All

# Grant Send As permission
Add-RecipientPermission -Identity "shared.mailbox@yourdomain.com" -Trustee "user@yourdomain.com" -AccessRights SendAs

Mailbox Forwarding

# Set up email forwarding and keep a copy in the original mailbox
Set-Mailbox -Identity "user.a@yourdomain.com" -DeliverToMailboxAndForward $true -ForwardingSmtpAddress "user.b@yourdomain.com"

# Remove forwarding
Set-Mailbox -Identity "user.a@yourdomain.com" -ForwardingSmtpAddress $null

3. Mail Flow & Transport Rules

# Get all transport rules
Get-TransportRule

# Create a rule to prepend a subject for external emails
New-TransportRule -Name "External Mail Warning" -FromScope NotInOrganization -ApplyHtmlDisclaimerLocation Prepend -ApplyHtmlDisclaimerText "<p><div style='background-color:#FFEB9C; padding:5px; border:1px solid <a href='/?search=%237D6608' class='obsidian-tag'>#7D6608</a>;'><strong>CAUTION:</strong> This email originated from outside of the organization.</div></p>"

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Created: March 17, 2026 • Last Modified: February 23, 2026