Set default calendar permissions for distribution list members

The script sets default calendar permissions for mailboxes who are members of a distribution list. To execute the script, you can create a custom command or a scheduled task configured for the Group object type.

Exchange On-Premises

Parameters:

$exchangeServer - Specifies the fully qualified domain name (FQDN) of the Exchange Server that will be used to perform the operation.
$accessRights - Specifies the user access rights to grant.

Edit Remove

PowerShell

$accessRights = "Reviewer" # TODO: modify me

# Connect to Exchange Online
$Context.CloudServices.ConnectExchangeOnline()

try
{
    [Object[]]$mailboxes = Get-DistributionGroupMember -Identity "%name%" -ErrorAction Stop | Where-Object {$_.RecipientType -eq "UserMailbox"}
}
catch
{
    $Context.LogMessage("An error occurred when retrieving group members. Error: " + $_.Exception.Message, "Warning")
    return
}

if ($mailboxes -eq $NULL)
{
    return # No members with mailboxes
}

foreach ($mailbox in $mailboxes)
{
    # Get Calendar object identity
    $calendarName = (Get-MailboxFolderStatistics -Identity $mailbox.ExternalDirectoryObjectId -FolderScope Calendar | select -First 1).Name
    $calendarIdentity = "$($mailbox.SamAccountName)`:\$calendarName"
    
    # Get Calendar permissions
    $calendarPermissions = Get-MailboxFolderPermission $calendarIdentity
    foreach ($permission in $calendarPermissions)
    {
        if ($permission.User.DisplayName -ne "Default")
        {
            continue
        }
        
        if ($permission.AccessRights -notcontains $accessRights)
        {
            Set-MailboxFolderPermission -User "Default" -AccessRights $accessRights -Identity $calendarIdentity
        }
        
        break
    }
}

Exchange Hybrid

Parameter:

$accessRights - specifies the user access rights to grant.