Sending via IMAP Exchange 2003 suddenly stopped working

This is both perplexing -- and maddening -- for months I have been able to SEND using mail.ourdomain.com via our Exchange 2003 server set up for Outlook Web Access.
Last night, I was trying to get my wife's iPhone to work with the same settings as mine -- which it would not.
During my fiddling, I reselected MD5 Challenge-Response checkbox for authentication. It was already checked, but once I reselected I could NO LONGER send email via IMAP / SMTP! It just hangs!
I've tried creating a "new" SMTP server from scratch -- but no luck. Same error ("Cannot Send Mail - The connection to the outgoing server "mail.ourserver.com" failed.
This is the first time I've tried to modify the SMTP sending setup since updating to iPhone 2.1 software.
Is there any DEFINITIVE set of steps for setting up the iPhone to work with Microsoft Exchange Server configured for OWA? (BTW, Receiving works perfectly).

Sounds like you should take it back to the shop, with BB, to ask for a replacement, and/or get your phone supplier to try with a different model of BB. Mine has not had the problem since using the latest touch screen Bold, so suspect that the BB s/w version does make a difference.

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