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I would also agree that with only 12 mailboxes an export from the sister company and import into the primary company is the quickest/easiest option. <br />
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Will.
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I would also agree that with only 12 mailboxes an export from the sister company and import into the primary company is the quickest/easiest option.

Will.

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Need to move approximately 12 email boxes from a sister company's SBS 2003 to our company's Exchange Server 2007. Both companies are in different domains and both reside in their own forest. Moving the users at our sister company into our company's domain is not an option so our Exchange Server will have to provide email services for users in two different domains (sister company and ours). Once the move of the mailboxes has been completed Exchange on the SBS 2003 server will be turned off. While I am familiar with Exchange I have never down a transfer across domains like this and would appreciate either a step by step guide to the process or a link that points to same. Thank you!
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Need to move approximately 12 email boxes from a sister company's SBS 2003 to our company's Exchange Server 2007. Both companies are in different domains and both reside in their own forest. Moving the users at our sister company into our company's domain is not an option so our Exchange Server will have to provide email services for users in two different domains (sister company and ours). Once the move of the mailboxes has been completed Exchange on the SBS 2003 server will be turned off. While I am familiar with Exchange I have never down a transfer across domains like this and would appreciate either a step by step guide to the process or a link that points to same. Thank you!

How to transfer mail boxes from SBS 2003 to an existing Exchange Server 2007 in a different domain?

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.