Comment 13 for bug 150571

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Alexander Sack (asac) wrote : Re: thunderbird-2.0.0.6 locking-up while downloading messages from an IMAP

what imap server are you running? you might need to tweak the max concurrent connections for your account settings -> YOURACCOUNT -> Server Settings -> Advanced ...

try to lower them in case your server doesnt allow 5 (or whatever is configured there)