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When Thunderbird starts, it downloads all email then locks up. With Anti-Virus turned on or off. Why?

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It says "not responding" as soon as I try to do anything. I re-start Thunderbird and it repeats the process. I cannot read the emails or perform any other function.

It says "not responding" as soon as I try to do anything. I re-start Thunderbird and it repeats the process. I cannot read the emails or perform any other function.

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