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10.5: Enable vertical split message viewing in Mail System 10.5
I loved Letterbox, a plug-in that allowed viewing Mail messages in a three-column vertical split window. After I upgraded to Leopard, I immediately tried to re-enable veritical split view. After much failed fussing with strings and MailVerticalSplitView, I decided to try editing the .nib files directly. What follows is a somewhat inelegant hack, but good enough for the time being (or until someone far better at using Interface Builder comes up with a fix):

First, quit Mail, then back up, then go to this directory: /Applications/Mail.app/Contents/Resources/English.lproj. Open MessageViewerContents.nib with Xcode (Interface Builder). Click the divider, and in the Inspector, check the Vertical checkbox, and save. This will enable vertical mode, but cause some issues with the divider still being drawn. To fix this, rename mainSplitterBar.tiff and MainSplitterDimple.tiff to mainSplitterBar-bak.tiff and MainSplitterDimple-bak.tiff.

When you relaunch Mail, vertical view should be on, and it's not too hard to undo. There are, of course, some issues -- i.e. to make the split smaller, you have to change the window size first -- but for the most part, it works great!

[robg adds: While Letterbox hasn't yet been updated for 10.5, there's a new entrant, WideMail, which does work on 10.5. I tested it, and it seemed to work quite well. I also tested the uninstaller, and it restored the standard Mail functionality. Just heed the Read Me's warning about making sure the Subject column is visible prior to uninstalling.]
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10.5: Enable vertical split message viewing in Mail | 6 comments | Create New Account
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10.5: Enable vertical split message viewing in Mail
Authored by: primitiveworker on Nov 12, '07 09:25:56AM
http://www.daneharnett.com/widemail/

WideMail replaces Letterbox with some additional functionality as well.  Comes with a nice installer/uninstaller package, and is cranking out updates.  Highly recommended.

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10.5: Enable vertical split message viewing in Mail
Authored by: isaacfinnegan on Nov 12, '07 10:01:57AM
WideMail looks very promising. But I currently am not using it. Right not the message list rows are manually spaced to support the 2-line view. So single line view and using different fonts is screwy. I will be watching closely. The problem with the hack that I had, was that I was then unable to resize the panes.

Letterbox works! To get letterbox working on Leopard. simply run the commands:
defaults write com.apple.mail EnableBundles 1
defaults write com.apple.mail BundleCompatibilityVersion 3

Then put the letterbox bundle back in the ~/Library/Mail/Bundles directory

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10.5: Enable vertical split message viewing in Mail
Authored by: aqsalter on Nov 12, '07 10:03:45PM

Letterbox does _not_ work.
The left-hand pane does not update and you get strange crashes... You also no longer get new mail updates.
If you are happy with these problems then use this fix... otherwise... wait for a later version or use widemail.
(Note: letterbox 0.16 is the latest version at time of writing)



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10.5: Enable vertical split message viewing in Mail
Authored by: kbrust on Nov 13, '07 12:04:48AM

For those who don't like the 2-line view of newer Widemail versions, there's still 0.0.3 available for download, which looks basicaly the same as Letterbox.

Widemail 0.0.3



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10.5: Enable vertical split message viewing in Mail
Authored by: pieterleemans on Dec 07, '07 09:54:06AM

letterbox is updated and works fine (widescreen) works fine too but don't use both at the same time



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10.5: Enable vertical split message viewing in Mail
Authored by: pieterleemans on Dec 07, '07 09:57:43AM

i mean widemail instead of widescreen of course



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