Get-MailboxCalendarDelegates.ps1

function Get-MailboxCalendarDelegates {
    <#
    .SYNOPSIS
    Retrieves a list of user delegated calendar permissions.
    .DESCRIPTION
    Retrieves a list of user delegated calendar permissions.
    .PARAMETER MailboxNames
    Array of mailbox names in string format.
    .PARAMETER MailboxObject
    One or more mailbox objects.
    .LINK
    http://www.the-little-things.net
    .LINK
    https://github.com/zloeber/Powershell/
    .NOTES
    Last edit   :   10/10/2014
    Version     :   1.0.0 10/10/2014
    Author      :   Zachary Loeber

    .EXAMPLE
    Get-MailboxCalendarDelegates -MailboxName "Test User1" -Verbose

    Description
    -----------
    TBD
    #>
    [CmdLetBinding(DefaultParameterSetName='AsStringArray')]
    param(
        [Parameter(ParameterSetName='AsStringArray', Mandatory=$True, ValueFromPipeline=$True, Position=0, HelpMessage="Enter an Exchange mailbox name")]
        [string[]]$MailboxNames,
        [Parameter(ParameterSetName='AsMailbox', Mandatory=$True, ValueFromPipeline=$True, Position=0, HelpMessage="Enter an Exchange mailbox name")]
        $MailboxObject
    )
    begin {
        Write-Verbose "$($MyInvocation.MyCommand): Begin"
        $Mailboxes = @()
    }
    process {
        switch ($PSCmdlet.ParameterSetName) {
            'AsStringArray' {
                try {
                    $Mailboxes = @($MailboxNames | Foreach {Get-Mailbox $_ -erroraction Stop})
                }
                catch {
                    Write-Warning = "$($MyInvocation.MyCommand): $_.Exception.Message"
                }
            }
            'AsMailbox' {
               $Mailboxes = @($MailboxObject)
            }
        }

        foreach ($Mailbox in $Mailboxes) {
            Write-Verbose "$($MyInvocation.MyCommand): Processing Mailbox $($Mailbox.Name)"
            $PossibleDelegates = @(Get-CalendarProcessing $Mailbox | Where {($_.resourcedelegates)}) 
            $PossibleDelegates | Foreach {
                $delegates = @()
                Foreach ($delegate in $_.resourcedelegates)
                {
                    $delegates += $delegate.Name
                }
                New-Object psobject -Property @{
                    'Mailbox' = $Mailbox.Name
                    'Delegates' = $delegates
                }
            }
        }
    }
    end {
        Write-Verbose "$($MyInvocation.MyCommand): End"
    }
}