functions/other/Get-AllCalendarFolders.ps1

function Get-AllCalendarFolders
{
    param (
        [Parameter(Position = 0, Mandatory = $true)]
        [string]
        $MailboxName,
        
        [Parameter(Position = 1, Mandatory = $false)]
        [psobject]
        $AccessToken,
        
        [Parameter(Position = 2, Mandatory = $false)]
        [switch]
        $FolderClass
    )
    Begin
    {
        if ($AccessToken -eq $null)
        {
            $AccessToken = Get-AccessToken -MailboxName $MailboxName
        }
        $HttpClient = Get-HTTPClient($MailboxName)
        $EndPoint = Get-EndPoint -AccessToken $AccessToken -Segment "users"
        if ($FolderClass.IsPresent)
        {
            $RequestURL = $EndPoint + "('$MailboxName')/Calendars/?`$Top=1000`&`$expand=SingleValueExtendedProperties(`$filter=PropertyId%20eq%20'String%200x66B5')"
            if ($AccessToken.resource -eq "https://graph.microsoft.com")
            {
                $RequestURL = $EndPoint + "('$MailboxName')/Calendars/?`$Top=1000`&`$expand=SingleValueExtendedProperties(`$filter=Id%20eq%20'String%200x66B5')"
            }
            
        }
        else
        {
            $RequestURL = $EndPoint + "('$MailboxName')/Calendars/?`$Top=1000"
        }
        do
        {
            $JSONOutput = Invoke-RestGet -RequestURL $RequestURL -HttpClient $HttpClient -AccessToken $AccessToken -MailboxName $MailboxName
            foreach ($Folder in $JSONOutput.Value)
            {
                Write-Output $Folder
            }
            $RequestURL = $JSONOutput.'@odata.nextLink'
        }
        while (![String]::IsNullOrEmpty($RequestURL))
        
        
    }
}