Hi All I have two Forests with Trust Relation between them (X1.com and X2.com). Can I use one Exchange Server in One of these Forest, and make all users in the two forests have their mailboxes on this Exchange Server, and all users have that same mail address domain name which may be different from the booth(#####@X3.org) or at least as one of them (####@X2.com for example). Thanks

Hi Alaay , Yes you can configure it and its possible but which version you want to configure plz confirm also I M giving you some link for Exchange 2010 configuration for cross forest. http://technet.microsoft.com/en-us/library/aa998597.aspx I hope you will get better knowledge from here. Regards. Shafaquat Ali.M.C.I.T.P Exchange 2007 M.C.I.T.P Windows Server 2008 M.C.T.S OCS Server 2007 R2

Yes you can. It is know as Exchange Resource Forest. What you have to is create a AD user in X2.com (no exchange server) then from forest X1.com, create a link mailbox. Just follow the wizard and you need admin permission to connect link mailbox to account which created in X2.com http://technet.microsoft.com/en-us/library/bb123524.aspx

Hi, You can do that deployment. The detailed information is below link: http://technet.microsoft.com/en-us/library/aa998031.aspx Thanks Allen

Hi All Thank you for the valuable replies. Can I d oit with Exchange 2003? or I have to use Exchange 2010 Thanks again

Hi Alaaay , Co-existence is possible in Exchange 2010 and Exchange 2003 but first of all give your environment details that what you have at your site than any body can help you in this regard. Regards. Shafaquat Ali.M.C.I.T.P Exchange 2007 M.C.I.T.P Windows Server 2008 M.C.T.S OCS Server 2007 R2

Hi, Of course, that is feasible in Exchange 2003. The name is external accounts. Understanding and using the External Associated Account in Windows Server 2003 and Exchange 2003 http://www.msexchange.org/tutorials/Understanding-External-Associated-Account-Windows-Server-2003-Exchange-2003.html Thanks Allen

Dear Shafaquat Thanks for your reply Really I’m still designing new schema I have two branches, these branches me divided any time to complete separated business entities. I am thinking to create two different forests and make trust relation between them, and I want to use only one exchange Server in one of them because I will implement cluster Exchange, and configure external OWA publish only to this Exchange. So Can I configure the Exchange 2003 to host the mailboxes for the second forest? And how it can be done? Thanks again

Hi Alaaay , If you want to get your branches up that it will be the better approach that make 2 different Sites in same Forest and Clustered mailbox in your main office so why you are trying to get different Forests ? It will easy to manage for you as per your approach that you want to make different Forests. Regards. Shafaquat Ali.M.C.I.T.P Exchange 2007 M.C.I.T.P Windows Server 2008 M.C.T.S OCS Server 2007 R2

This can be done in Exchange 2003 as well - it is known as Associated External Account. There are no scripts really that i know of to automate this, but essentially you have to create a user+mailbox in the exchange forest, then add the remote forest user to the 'Mailbox Rights' list and give the user Full Access and Associated External rights. If there is a migration of mailboxes involved here, Priasoft can do this as part of the migration, saving you many manual steps. http://www.priasoft.com/products.aspx Regards, Eriq