migrate mail from Microsoft Exchange Server 2003 to gmail

I am trying to migrate email from an in-house Microsoft Exchange 2003 server to gmail.  I found the gmail instructions for migrating mail here:
http://www.google.com/support/a/bin/answer.py?answer=61369&topic=14870

But first I have a few basic questions.  Is IMAP not generally used?  The exchange management shows that IMAP is not enabled.  I tried right-clicking on it and clicking on Start but it timed out without starting.  Also, do I need to open port 143 and "forward" the port to Exchange Server?  If so, how do I do that?
RC123Asked:
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RC123Connect With a Mentor Author Commented:
I never could figure out how to get the gmail IMAP migration tool to work.   There are too many variables to guess at what the settings should be.   I ended up just using the gmail uploader tool on each account, one by one, very slowly.
Thanks to tigermatt for trying very hard to help.
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tigermattConnect With a Mentor Commented:

IMAP is not enabled by default, as Exchange has better ways of remotely accessing the server: Outlook Web Access and RPC over HTTPS (Outlook Anywhere in Exchange 2007). IMAP is considered a legacy technology which is not required in a proper Outlook and Exchange configuration.

There would be no harm in starting the IMAP service to facilitate this migration. The IMAP port 143 needs to be open through your firewall to the Exchange Server, otherwise IMAP will not be accessible externally and therefore will not be available for Gmail to access.

-Matt
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RC123Author Commented:
I can access the mail on the server from Outlook Web access
https://sbs.mydomain.org/exchweb

How do I enable IMAP, I tried right-clicking on it and clicking on Start but it timed out without starting.  Also. how do I open port 143 through the firewall as you mentioned?
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tigermattConnect With a Mentor Commented:

You need to ensure the IMAP service is first starting in the 'Services' panel (Control Panel > Administrative Tools) prior to starting the IMAP Virtual Server in Exchange.

The operation to open the port through the firewall is dependent on your firewall hardware and its management interface; http://portforward.com has a good set of guides for most firewalls.

-Matt
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RC123Author Commented:
When I look in the in the 'Services' panel (Control Panel > Administrative Tools) should I see IMAP listed and then what, right-click to start it?  I don't see it in the Services list.
Also, if anyone has any advice on how I can connect remotely to my Window small business server 2003, the advice would be appreciated.  I tried everything I could find in the server manager to allow remote access.
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tigermattCommented:

Connecting remotely to your SBS in terms of Remote Desktop or some other way is beyond the scope of this question; I'd suggest you ask a new one for that.

The IMAP service is listed as 'Microsoft Exchange IMAP4' and is disabled by default.

-Matt
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