After applying E2010 SP1 iPhone users may not be able to view the content of incoming messages in their Inboxes, and when they try to open a message, they get an error that this message has not been downloaded from the server.
Also OWA Premium users may not be able to reply or forward a message. They may see the following error in OWA:
‘An unexpected error occurred and your request couldn’t be handled. Exception type: System.ArgumentException, Exception message: imceaDomain must be a valid domain name.’
And POP3/IMAP4 users may also not be able to retrieve incoming mail.
The issues are caused by non-standard domain names. Verify that there is one domain marked as ‘Default’ and it’s DomainName and Name values are valid domain names, and e.g. don’t have a space within the domain name.