Just a heads up… If you updated to 10.8.4 and the Apple Mail plugin was deactivated, can just reinstall the Apple Mail plugin by selecting the DEVONthink menu item > Install Add-Ons…
And optionally, ~/Library/Mail/Bundles (Disabled*) folders, or just older versions of this and other mailbundles in them, can be manually deleted.
I have tried repeatedly to install the Apple Mail plugin, but with no luck. I keep getting the following message in a box:
Can’t access defaults of Apple Mail. Will not install plugin for it.
Please use the Mail application by setting it up before installing the Apple Mail plugin again.
I have been using Mail forever…it is not newly installed.
Are you on 10.8.x?