Have a client running Outlook 2007 on an SBS2003 network. She sends out meeting requests to business contacts outside the office with no problem. But when she tries to send a meeting update (IE change the meeting time or cancel the meeting) she gets a bounceback with a delivery status notification:
This is an automatically generated Delivery Status Notification.
THIS IS A WARNING MESSAGE ONLY.
YOU DO NOT NEED TO RESEND YOUR MESSAGE.
Delivery to the following recipients has been delayed.
This happens sending to many different domains, so it's not just the recipient domain. We had someone else in the office try with Office 2003, and they said it worked fine. Any ideas?