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I'm using Thunderbird to download mails from a Hotmail account. It works all right, except that the mails in the server are only marked as read when I log in to the webmail service and read them there. Thunderbird internally does mark them as read, it's just that the server ignores that. This works fine with my GMail account.

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What protocol you using? POP3 or IMAP? –  MicTech Aug 2 '09 at 15:12
    
POP3 for Hotmail (the only one avilable), IMAP for Gmail. –  Javier Badia Aug 2 '09 at 17:07

2 Answers 2

up vote 3 down vote accepted

Thunderbird internally does mark them as read, it's just that the server ignores that.

With POP3, there is no way to tell the server about local state (read/deleted/etc). It can only go in a single direction - from server to your computer. So the server can't even know.

Basically, everything POP3 can do is: get number of messages; get a list of message sizes; download a message; delete a message from server.

(Some POP3 servers do mark messages as read server-side once you download them over POP3, but this is not very reliable, and many dislike it.)

IMAP4 (the one you use with Gmail) can do much more - folders, downloading headers only, search, sometimes even shared inboxes.

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In gmail go to Settings->Forwarding and POP/IMAP->2. When messages are accessed with POP and change the value to mark Gmail's copy as read. The messages should no longer be marked as unread after you have accessed them from your email client.

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