With the new launch of Office 365, the entire platform is consolidated with Exchange 2013, SharePoint 2013 and Lync 2013. However, when working with a customer to connect Outlook 2010 to Exchange Online in new Office 365, it prompts for password again and again and it cannot connect while saying the Exchange Server is offline.
In this situation, the SMTP address is displayed incorrectly. For example, the address is displayed as GUID@DOMAIN.COM.
Here comes to the solution.