[lubuntu] Thunderbird in ubuntu

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http://ubuntuforums.org – Hi. I'm running Thunderbird 15.0.1. Today, I found I could not search for some emails though I KNOW they are there. (I have 1 login but 15 or so email accounts) I googled & found that some people say to delete the *.MSF files, & your messages will re-index. (we're using IMAP) QUESTION :- I'm old-school with Windows. & if I searched for *.mdf in windows, I'll get a list of all the files along with the directory info. If I use Nautilus, * search *.msf, I get a blank screen - Nothing happens. Q1:- How do I search all *.msf files in Nautilus ? Q2. Is there an internal process (Hardware)