Thanks to the power of the internet, we have a fix to the WideMail problem
I mentioned last night. This is an update to the method found by gravesit
and posted on the Apple Forums
last year. From that, I knew what needed to be done, but lacked an essential detail. First, you need to locate the WideMail bundle. This will normally be in:
~/Library/Mail/Bundles (~ means your home folder, usually the same as your user name). Open the Widemail.mailbundle folder, then the Contents folder. You need to edit the file called Info.plist – you can either use a text editor, or the Property List Editor. If you have XCode installed, it will open there, which is fine, too.
If Mail has already disabled WideMail, you’ll find it (as I did) in a folder called Bundles (Disabled).
You’ll see a lot of settings, but the one we’re interested in is labelled SupportedPluginCompatibilityUUIDs - you need to add new values to this. The detail I was lacking was the little matter of knowing what values I needed to add. But overnight I had three separate comments from gravesit, Michael Silvestre and Boris Strahija suggesting various combinations of values. I decided to start with Michael’s as that only involved adding two values to the file:
To avoid confusion, I first disabled Letterbox then closed Mail. Then I added those two values to the file and saved what I’d done. I then copied the WideMail.mailbundle folder back into the “live” Bundles folder and started Mail again.
And WideMail returned! Woo, hoo!
This is, of course, easier if you do it before upgrading MacOS X to 10.6.7, as you won’t then need to reset preferences and fiddle with columns again as I just had to. I’ll be sure to do that before I update the iMac later today.
Thanks to everyone who replied to my posts with help!
 Seriously, after posting about WideMail last night, I found my own posts appearing in Google within a very short time…