Random notes that used to be relevant on this wiki, but are now 15+ years old. You probably shouldn't use this.

In certain environments (including MS Exchange), when a message is forwarded, the special "Sender" field indicates the actual person who clicked "send", while the "From" field shows the originator of the message. This is confusing in Thunderbird, which doesn't show "Sender" by default, so forwarded email looks like it came from the originator of the message. To show the "Sender", set the following custom settings:

mailnews.customHeaders = Sender
mailnews.headers.extraExpandedHeaders = Sender

update-rc.d sucks. Use rcconf instead:

$ sudo apt-get install rcconf
$ sudo rcconf

Change shortcut to:

explorer.exe /e,::{20D04FE0-3AEA-1069-A2D8-08002B30309D}

From here.

Firefox 5 and now Thunderbird 5 like to have their menu and toolbars be the Windows titlebar color for some goddamn reason, and it looks like crap. To fix, you want the "just grey" persona – It should work for both Firefox and Thunderbird.

Those chuckleheads are Mozilla seem really determined to completely run their software into the ground. The latest "rapid release" of Thunderbird moves tabs above menus and provides no option to override this behavior…in fact, they gloat about it on the "what's new" page as basically the only visible improvement to the email client in this update! If you want security and feature updates, you need to beat back their UI retardedness. To put the tabs back under the menu bar:

1. Open Help → Troubleshooting Information and click on the "Open Containing Folder" next to "Profile Directory" in the first block.
2. Make a directory "chrome" and create "chrome\userChrome.css" with the following content to force the menu bar to be located above the tab box:

#tabs-toolbar {
  -moz-box-ordinal-group: 20 !important;
}
#mail-toolbar-menubar2 {
  -moz-box-ordinal-group: 10 !important;
}

From here.

ubuntu: have firefox use thunderbird for mail: goto about:config, new string key "network.protocol-handler.app.mailto" → "/usr/bin/mozilla-thunderbird" ("/usr/bin/thunderbird" for Ubuntu 7.10)

if ubuntu's packages get busted, "dpkg –configure -a"

to auto-switch between wireless and wired connection on Windows, this thing seems to work well enough: http://www.wirelessautoswitch.com/About.aspx