PowerShell commands for managing calendar permissions.

calendar_permissions.ps1

# Tristan Madden
# 2021-09-16
# trimad.github.io

# Get connected to Exchage Online Management
Import-Module ExchangeOnlineManagement
Connect-ExchangeOnline -UserPrincipalName <UPN>

# Get a list of all mailbox aliases
# Source: https://docs.microsoft.com/en-us/powershell/module/exchange/get-mailbox?view=exchange-ps
$users = Get-Mailbox | Select -ExpandProperty Alias

# Add AccessRights for a user to all mailboxes
# Source: https://docs.microsoft.com/en-us/powershell/module/exchange/add-mailboxfolderpermission?view=exchange-ps
Foreach ($user in $users) {Add-MailboxFolderPermission $user":\Calendar" -User <UPN> -AccessRights PublishingEditor}

# Set AccessRights to a user for all mailboxes. You would do this if AccessRights already exist and you need to overwrite them.
# Source: https://docs.microsoft.com/en-us/powershell/module/exchange/set-mailboxfolderpermission?view=exchange-ps
Foreach ($user in $users) {Set-MailboxFolderPermission $user":\Calendar" -User <UPN> -AccessRights PublishingEditor}

# Get the current access rights this user has for all mailboxes.
# Source: https://docs.microsoft.com/en-us/powershell/module/exchange/get-mailboxfolderpermission?view=exchange-ps
Foreach ($user in $users) {Get-MailboxFolderPermission $user":\Calendar" -User <UPN>}