Hello, We are looking at two separate companies that have merged, Both have their own SBS 2008 server and associated environment and are looking to merge the IT infrastructure. The intention is to remain as separate entities but share the same IT platform/premises. They would like each set of employees to have access to the other companies shared data on the network as well as running two domains for email. The email aspect is key, They need to be able to both Receive email through the same gateway for both domains but also be able to send email from both domains. At present we have two SBS 2008 boxes, We know one needs to go, The email is the major issue, How do we set it up that we can have a proper two domain email setup and prove reliable? Users sending email may need to be able to select the primary domain which would be the company that they originally belonged to in order to maintain the separation in question. If it can't be done any alternative suggestions?