Just upgraded to Exchange 2010 SP3 U1- have not yet decommissioned our Exchange 2003 server as a few users are still running off the old server.
When looking in Outlook 2010 to view what the URL is to access this account on the web, it shows the correct external URL as configured in the EMC.
In Outlook 2013, it shows the internal URL to access this account on the web, which is incorrect. I have triple checked the OWA settings for internal and external URL and all look good.
Outlook 2013 is fully updated .