I am having calendar updates to different domains error out with Could not deliver the message in the time limit specified. Please retry or contact your administrator. We are running Exchange Server 2003. Standard emails get through fine. Calendar updates within our own domain do not seem to have problems. This delay and ultimate non-send is occurring both on a SMTP connector directly to the IP of a smart host as well as to other domains where we use a general DNS connector. I haven't found something specific to my issue searching online, so I wanted to see if anyone out there may know why this is happening off chance. I did find mention of a similar problem going from Exchange 2003 to Exchange 2007, but the company that we are pushing to via IP of the smart host is running Exchange 2003. Thanks for any help you can give me, BabaFree