Retrive and export all Public folders with GUID

# Get all mail-enabled public folders
$mailEnabledPublicFolders = Get-MailPublicFolder

# For each public folder, get the email address and MailRecipientGuid
$mailEnabledPublicFolders | Select-Object Name, @{Name="MailRecipientGuid";Expression={$_.Guid}}, PrimarySmtpAddress | Export-Csv -Path "C:\Path-to-File.csv" -Delimiter ';' -Encoding UTF8 -NoTypeInformation