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One key problem with Yahoo IMAP access, it seems to me, is that the backend doesn't appear multi-threaded.
If I am in a Yahoo account with the IMAP client, and then I POP check the same account, I always get a message on the POP check that the mailbox is in use. I also get login errors from the gimmicked Thunderbird beta, and while I haven't tried logging the session to track down the errors, it looks like they are also "mailbox in use" type errors.
To me, this looks like a big reason that Yahoo hasn't rolled out IMAP except where absolutely required, like on the Apple products.
Gmail and AOL do not give these errors on multiple access to a mailbox, and I suspect these errors are against protocol for IMAP.
It seems to be a serious limit on Yahoo IMAP access.
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