Tabbed browsing is on e of the coolest feature that a modern browser actually has, but why not adding it also on an email client? Why not having the possibility to open email messages in separate tabs?
Myk Melez has think about this and he has launch a new (unofficial) release of Mozilla Thunderbird email client with tabs:
With this Thunderbird version, you can open every email message on a separate tab, really useful when you want to work with different email messages that are not consecutive on the message list. Using the new feature is simple, just right-click a message header and select "Open Message in New Tab" from the context menu.
This feature is really cool I think, and I hope to see it embedded on the future Thunderbird versions (and maybe also on the future Outlook).
If you want to try out the feature, here you can download the Thunderbird tabbed versions for Windows, Mac, and Linux.
I love Tabs... 