User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11 Build Identifier: Thunderbird 3 will get nice tabbed interface. And with the patch in Bug467768, the feature will be useful for many people. I think we should use the tabbed interface as much as possible. Currently we can open messages and calendar in a tab. Bugs to open Compose window and Address Book in a tab are already filled. I'm asking for the ability to open external saved .eml files in a new tab, instead of a separate window, depending on the option, which we got with Bug467768. Reproducible: Always Steps to Reproduce: 1. Open an external saved .eml file in Windows Explorer via doubleclick 2. 3. Actual Results: It will be always opened in a separate window Expected Results: Should be opened in a tab, depending on the option under Preferences -> Advanced -> Reading & Display -> Open messages in