Exchange 2003 To Office 365 Migration Issue

I have a client on Exchange 2003 SP2 that I'm migrating to Office 365.  I've done many of these in the past including some from Exch2003.  I'm unable to get communication to work.  I use testexchangeconnectivity.com to run an Outlook Connectivity test and got a 443 blocked error (The specified port is either blocked, not listening, or not producing the expected response.).  I've run through the RPC/HHTP config again, made sure the 6001-6002 and 6004 ports are open, I installed a third party SSL cert (client previously only used Exchange for internal email).  I can browse to https://<FQDN>/oma and https://<FQDN>/Exchange for OWA access.  I can telnet fine to port 443 from remote hosts.  Can anyone give me an idea to look at next?
SafetyNet-TCAsked:
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Marshal HubsEmail ConsultantCommented:
Sometimes these connectivity issues could be really hard to troubleshoot, same has happened to me once. In my case, Outlook was unable to connect to the server & "offline" status was getting displayed.
To resolve the issue,

1. From Outlook’s "File" menu option, verify if there is a check mark beside "Offline".
2. If yes, click "Offline" in the File menu and allow the client to connect again.

After all manual set up, I preferred professional migration solution, rather than going for complex manual Import-Export process. I tried Stellar EDB to PST converter & successfully migrated all of my mailboxes from Exchange 2003 to Office 365 in quick time with completely intact mailbox structure.

You can know about this software by visiting: http://www.stellarinfo.com/email-repair/edb-pst-converter.php
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SafetyNet-TCAuthor Commented:
This isn't an Outlook issue.  I'm using testexchangeconnectivity.com.  O365 has a cutover migration process, there's no reason to use a third party solution.  Any other ideas?
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SafetyNet-TCAuthor Commented:
Self resolved.  Stale DC in AD, removed with ntdsutil, issue resolved.
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SafetyNet-TCAuthor Commented:
Self resolved.
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