We recently installed an Exchange 2007 server. One of our users gets this error message only when sending a new message to a distribution list. She has 5 or 6 dist lists, they all work intermittently, when they do not this message appears "An unexpected error has ocurred"Has anyone else seen this problem?I have blown away the outlook profile and recreated and re-imported her mailbox data, but to no avail.Any help appreciated.Thanks,Rich