Setting Up Team Calendars in Exchange / Outlook 2010

#Load Exchange Server 2010 Management Shell if not loaded. You may delete/comment out this step if you are running the script from the Exchange Management Shell
if (-not (Get-PSSnapin | Where-Object {$_.Name -like "Microsoft.Exchange.Management.PowerShell.E2010"})){
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
}

#Custom variables
$mailboxes = Get-Mailbox  -RecipientTypeDetails userMailbox
$AccessRights = "LimitedDetails"

#Loop through all mailboxes
foreach ($mailbox in $mailboxes) {

#Retrieve name of the user`s calendar
$calendar = (($mailbox.SamAccountName)+ ":\" + (Get-MailboxFolderStatistics -Identity $mailbox.SamAccountName -FolderScope Calendar | Select-Object -First 1).Name)

#Check if calendar-permission for user "Default" is set to the default permission of "AvailabilityOnly"
    if (((Get-MailboxFolderPermission $calendar  | Where-Object {$_.User -like "Default"}).AccessRights) -notlike $AccessRights ) {

    Write-Host "Updating calendar permission for $mailbox..." -ForegroundColor Red

    #Set calendar-permission for user "Default" to value defined in variable $AccessRights
    Set-MailboxFolderPermission -User "Default" -AccessRights $AccessRights -Identity $calendar
    }
}

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