Hi, We are on Exchange Server 2007 which is hosted off our premises, with Apptix (http://apptix.com). And our partner company also has an account with them. But they (Apptix) say that if we are on different accounts with them, the Exchange Sharing & Collaboration features cannot be used between two of our (our's and our partner's) domains. I want to know if there are any possible ways of sharing and collaborating between our users (like Sharing of Calendars) in this scenario ? Many thanks for your help ! Regards Yagyesh