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The company I work for has just purchased a few small companies and wants to host them on a single exchange server<br />
I have a spare server and license for exchange 2013<br />
Idealy we would have companya, companyb, companyc etc... they would not have access to each others global address list and ideally i would like them to login as user@companya.com etc.. <br />
Is this possible and is there any good guides anywhere on how to acheive this ?<br />
They would not have access to our AD ... this is simply just an email solution<br />
<br />
Many Thanks
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The company I work for has just purchased a few small companies and wants to host them on a single exchange server
I have a spare server and license for exchange 2013
Idealy we would have companya, companyb, companyc etc... they would not have access to each others global address list and ideally i would like them to login as user@companya.com etc.. 
Is this possible and is there any good guides anywhere on how to acheive this ?
They would not have access to our AD ... this is simply just an email solution

Many Thanks

Exchange 2013 - Multi Tenant

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.