Open .eml files in compose mode in outlook 2010

问题:

I want my users to be able to open eml files in compose mode in outlook 2010, by default it opens in readonly mode. Is there any way out?

Use: We generate email templates which the users can download and customize it before sending.

回答1:

If you can add the header "X-Unsent: 1" to your .eml, it should open in Compose mode.

回答2:

Works on Microsoft Outlook but does not work on thunderbird.

A related discussion can be found here https://bugzilla.mozilla.org/show_bug.cgi?id=688284