We have several employees using Thunderbird (including myself) for their work email. Read and sending messages has been working fine, but copying or moving messages from local folders to the server does not seem to work. If I attempt to move or copy 1 message at a time, this works fine most of the time. If I select multiple messages, it fails after copying one or two, complains that the login failed and requests the user's password again. I have tried this with Thunderbird v1.5.0.9 and v3 alpha 1 (20070206) and see the same results. As a test, I tried to perform the same operations on another mail server (running Courier-IMAP) using both versions of Thunderbird, and they completed with no problems.
I have tried disabling the use of IDLE in Thunderbird, as well as setting the maximum connections to 1.
Has anyone run across this problem before?