Assuming you have registered a domain name already (like mycompany.com), have
it currently hosted with an ISP, are using associated email addresses (like
(e-mail address removed)), and have a static IP address for your Internet
connection (ie, cable or DSL)... You can easily move from POP3 email
addresses to pure Exchange email addresses without changing your address.
With this scenario, it is a matter of changing the MX records to point to
your static IP address at your office, open port 25 on the firewall and
direct to the Exchange server - be sure the server is secured with all its
patches, AV (like Trend Micro ScanMail), and (optionally) set IMF for
Exchange 2003 SP2 BEFORE setting Exchange to receive mail directly. One more
note, be sure to have your static IP address resolve to your external mail
server name (ie, mail.mycompany.com resolves to x.x.x.x and x.x.x.x resolves
to mail.mycompany.com). I would make the changes for all this on a Friday
afternoon to allow for DNS replication over the weekend. That's the basics of
it anyway.
If you are still using your ISP's domain name in your email addresses, then
you need to decide if switching to mycompany.com email addresses is what you
want to do. Personally, I believe it is well worth it - having used and
administered many Exchange servers at several organizations. Exchange
provides a LOT more control and flexibility for your email and scheduling
needs than POP3 alone. POP3 and Exchange mailboxes as a combo (like you are
doing now) just complicates matters for you.
Alternatively for the calendaring issue, you could create a separate account
in Exchange called "Master Calendar", set the permissions on the account to
allow everyone (or select people) to create/modify/delete/see only the
calendar item in the mailbox, then add it as a second account to view from
within Outlook. The Public Folder Calendar option works great too and will
have less adminitrative needs. Likewise, you can create a Public Contacts and
Tasks lists in the Public Folders too - and set specific permissions (either
group or individual) on every list or folder too!
Another suggestion: Use Outlook 2003, configure it for cache mode (after
switching purely to Exchange mailboxes), and set the Junk E-mail options
appropriately (most like the "High" setting lately) to work with IMF for
controlling SPAM.
Good luck!
TimothyS - [MCP]
Systems Administrator