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Re-enable Mail plug-ins in OS X 10.8.4 Apps
With OS X 10.8.4, Apple has updated Mail, which means that plug-ins that are not up-to-date won't work, and will be placed in a ~/Library/Mail/Bundles (Disabled) folder. In order to get any plug-ins to work, you'll need to find the new UUIDs and add them to the plug-ins' info.plist file.

We ran a hint about this back in 2010, but it's good to remind people how to do this. You want to run two commands in Terminal to get two different UUIDs:
defaults read /Applications/Mail.app/Contents/Info PluginCompatibilityUUID

defaults read /System/Library/Frameworks/Message.framework/Resources/Info PluginCompatibilityUUID
For OS X 10.8.4, the UUIDs are:

19B53E95-0964-4AAB-88F9-6D2F8B7B6037
2183B2CD-BEDF-4AA6-AC18-A1BBED2E3354

Look inside your plug-in's folder, and find the info.plist file, in a Contents sub-folder. Double-click the file to open it with Xcode, or use a text editor. If using Xcode, click the disclosure triangle next to SupportedPluginCompatibilityUUIDs, then click + to add each new UUID.

If you're doing this with a text editor, you want to add the new UUIDs in the end section of the file, which looks like this:
<key>SupportedPluginCompatibilityUUIDs</key>
<array>
	<string>2183B2CD-BEDF-4AA6-AC18-A1BBED2E3354</string>
	<string>19B53E95-0964-4AAB-88F9-6D2F8B7B6037</string>
	<string>2DE49D65-B49E-4303-A280-8448872EFE87</string>
	<string>1146A009-E373-4DB6-AB4D-47E59A7E50FD</string>
	<string>6E7970A3-E5F1-4C41-A904-B18D3D8FAA7D</string>
	<string>EF59EC5E-EFCD-4EA7-B617-6C5708397D24</string>
	<string>4C286C70-7F18-4839-B903-6F2D58FA4C71</string>
	<string>608CE00F-4576-4CAD-B362-F3CCB7DE8D67</string>
</array>
Move the plug-in back to the ~/Library/Mail/Bundles folder, quit Mail, then relaunch it, and the plug-in will get loaded. However, this doesn't mean that the plug-in will work; there may have been changes to Mail which require further updates to the plugin. YMMV.
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Re-enable Mail plug-ins in OS X 10.8.4 | 6 comments | Create New Account
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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: petersconsult on Jun 06, '13 08:35:32AM

Sadly, the free version of GrowlMail no longer works in 10.8.x....
sigh...



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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: lowbatteries on Jun 06, '13 08:43:13AM

I was searching for how to do this yesterday and came across http://code2k.net/products/mailpluginfix/ - its a small app that automates adding the proper IDs and re-enabling the plugins. Pretty sweet.



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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: cleanhead on Jun 06, '13 08:47:57AM

Great tip. But there's a typo in one of the UUIDs you list for 10.8.4. The correct one is: 19B53E95-0964-4AAB-88F9-6D2F8B7B6037 (no "O" on the end). Thanks!



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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: kirkmc on Jun 06, '13 09:52:07AM

Extraneous character; thanks, fixed.

---
Mac OS X Hints editor - Macworld senior contributor
http://www.mcelhearn.com



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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: jocamero on Jun 11, '13 02:50:08PM

This doesn't work in 10.9 DP1 if anyone is wondering.

It seems as if the PluginCompatibilityUUID key has been removed from the /System/Library/Frameworks/Message.framework/Resources/Info.plist

The PluginCompatibilityUUID is still however in the /Applications/Mail.app/Contents/Info.plist



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Re-enable Mail plug-ins in OS X 10.8.4
Authored by: angdove on Aug 28, '13 09:46:12PM

Trying to apply the change in plugins from the instructions here but falling at first hurdle. Where do I find "plug-ins" folder"?



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