It seems that when I go to https://mail.company.com/owa from within the organization, it launches OWA (Exchange Server 2013) just fine, and I'm able to authenticate through to get my mailbox.  However, when I am outside the organization, and I go to the same OWA URL, I get the webmail login page for the old mail server (SBS 2008/Exchange Server 2007).  Can anyone assist me with this?  Thank you.

• Edited by Fernando Chanco Sunday, July 05, 2015 8:48 AM

Do you mean you access from Internet by "about the organization"?

The problem is at the public DNS server of company.com. The A (or CNAME) record of mail.company.com is resolved to the old mail server.

• Marked as answer by Fernando Chanco 4 hours 30 minutes ago

Thank you all for your suggestions.

It turns out that the public DNS record was not changed.  So, once that was changed on the DNS registrar (e.g., Network Solutions), and the firewall external rules were modified to reflect it, OWA started working correctly :)