In an external hard drive I have a backup of my email when I use Thunderbird (late 2009), it i around 12G. Now I need to find some old messages and using OS X Lion, I wonder how could I access and search through all that email messages, not importing all email to my laptop's hard drive. I wonder if using Thunderbird (last OS X version or a previos one) one can just tell Thunderbird to read all email from those files but not importing them.