Hello. I run Ex 2003. Another company has Domino. I am on AD 2003 R2 and I have no idea what the other company uses. The companies want to be able to send calendar appointments to each other. We use Outlook and they use Lotus Notes. Can I use the exchange tools to allow this to work, if the Domino server is in no way whatsoever affiliated with my network, domain, or forest? Or would the Domino server have to be part of my network? We do not share any other communication and do not have any tunnels, etc set up between the companies. Thanks much in advance if anybody knows the answer to syncing up Domino and Exchange between two completely separate companies in different states that do not share AD in any way whatsoever.