I’m frustrated

Email messages disappear in Thunderbird

I am using Thunderbird for a while now. Previously when I received emails in the inbox and close the program to get back to the emails later they were still there in the inbox. Now if I dont copy the emails to another folder immediately, and close the program all the emails are gone and I cannot find them. This makes things very difficult if I get busy or have to answer the telephone. I forget about the problem and when I open Thunderbird again all the email messages are gone.
I have lost very important information because of that. I am using version 7.01.

I am afraid that if I upgrade I am going to have more problems. Can you please give me information to export or import all my info to Outlook. I am frustrated because of all the problems.

Sorry about my earlier message wont happen again
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