Well, this has happened a few times to myself and others. Thunderbird has worked great for the past couple months and now all of a sudden It's lost my email. When I start up PortableApps and launch Thunderbird, it wants me to setup a new account. My mail seems to still be in the ThunderbirdPortable>Data>profile>Mail directory. Does anyone have any suggestions on how to get this back? The last time it happened I just reinstalled and setup my account again, but I would really like to know how to fix this.
Sorry, must not have researched the issue very well. I found the solution here: http://kb.mozillazine.org/Recovering_a_profile_that_suddenly_disappeared
Thanks anyway.