Email received from a sender using Outlook includes a Winmail.dat attachment instead of default format.
Microsoft Outlook supports different formats of email messages. Microsoft has its own MIME format that is not supported by other email clients. This format is used for email communication between Microsoft Outlook profiles in the company intranet. It can happen that this format is also used for sending messages out of company.
All versions of eWay-CRM
Microsoft released fixes that should solve this issue: