RigorM 0 Newbie Poster

Hey guys,

My office is made up of 3 sister companies in the same building.

The entire office runs a domain controller (Windows Server 2003 SBE) with a single domain for logging in of all staff of the 3 sister companies.

Currently our e-mails are not being hosted in-house so in other to send and receive mails we need access to the internet as our mails are being hosted by a company in the US(our company is not in the US).
Assume the mail domains are A1.com, B2.com and C3.net.

We now want to start hosting our mails in-house using Exchange Server 2007. I need to know if one dedicated server running the Exchange Server 2007 can do this (that is run these three e-mail accounts).

If so how can I go about this.