http://www.aliasbailbonds.com/KeeFor...thunderbird-31
They have the patches for using Yahoo IMAP on Thunderbird 3.1, plus a compiled Windows Binary.
A big upgrade from shredder...
(make sure you unpack it over Thunderbird 3.1, and not over Shredder. I copied my 3.1 over Shredder, and this over the 3.1 in the old Shredder location.)
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Thunderbird 3.1 is much better at IMAP error handling than Shredder.
And that quality reveals just how much the Yahoo IMAP server isn't really ready for prime time.
On folders with thousands of messages it chokes, gives not ready, inaccessible and other errors. Probably related to only one access of a mailbox at a time.
It makes me understand why Yahoo delivers IMAP where they have to, on mobiles and such, but don't offer the kind of open IMAP access that AOL and Gmail support.
It would seem to be a headache for all concerned.