I'm considering using Thunderbird as an IMAP client to our corporate email. Policy dictates that we store all email on a network drive (thanks, SOX). But I would like to be able to access my email folders offline as well. SO: does anyone know whether Thunderbird can reliably operate on a network drive that is sync'ed (using Windows 7 file synchronization) to the local hard drive? This was not possible with Outlook due to file locking. I'm worried that Thunderbird might have similar problems with trying to use a sync'ed drive and that either Thunderbird will fail or Windows sync won't work correctly.