We are are a company with a main office and 20 branch offices throught Europe who are in different domains and some office don’t have Servers. We have an Exchange 5.5 Server and will be migrating to a more powerful Exchange 2003 Server for our mailboxes.
At the moment all the office email is hosted by an ISP on a common
.com domain. If i host the email for this domain on our new Exchange 2003 Server how are the other offices to connect to get their email from this Exchange Server if they are in different offices with different domain names in outlook. I know with OWA they can connect but how do they download email via Outlook? Do i have to create an OU for each office for them to connect ? Must i use POP3 accounts for them in Outlook ? Please help