hello .. im planning to install a MS exchange 2010 on my company , and im not much familiar with exchange server so please help me to complete the installation and configuration . my requirements are as follows . One Head Office and two site office (ex: head office, company1 and company2). and for all these companies are having their own web site (ex: www.headoffice.com, www.company1.com , www.company2.com). i will install only one exchange server in my head office , and i want to have the user mail boxes for other company also to send mails internal and external domain. (ie. user should able to send mail to other external domain like gmail.com, yahoo.com etc....) (ex: user@headoffice.com,user@company1.com, user@company2.com). and for each user must be able to have access to the WEB MAIL. so please guide me , to configure exchange 2010. thanks and regards. Anjo .

Installing Exchange 2010 Sp2 on Windows Server 2008 R2 Sp1 http://careexchange.in/installing-exchange-2010-sp2-on-windows-server-2008-r2-sp1/ -- Create 3 Email Address Policies depending on User OU's If you already have one , Upgrade them -- If its a large Environment , Setup Co existence or Install a 3rd party Cert and get OWA ready -- Go through this Guide , so that you can get some views and idea http://gallery.technet.microsoft.com/Rapid-Migration-Guide-from-7ade7012Satheshwaran Manoharan | Exchange 2003/2007/2010 | Blog:http://www.careexchange.in | Please mark it as an answer if it really helps you

Hi Are there three AD domain in your company or just one? 1. Three AD domain. You should install exchange on each domain. One exchange server is useless. 2. One Ad domain. You can read all account. Create two new accept domain,mx recorder and add other smtp address of same user. http://technet.microsoft.com/en-us/library/aa996314.aspx http://technet.microsoft.com/en-us/library/bb124911.aspx Terence Yu TechNet Community Support