Thunderbird allows you to tag messages with predefined (or your own) tags, for example. Do, Later. (Press "1" while reading the message.)
These tags are replicated to the IMAP server (I checked that using two TB clients: I saw the same tags on both clients).
How can I access tag information in PHP using the standard IMAP class (for example: msg set the tag "To Do")?
I found the old link http://www.wynia.org/wordpress/2007/02/alternate-imap-solution-for-php-pear-net_imap in net_imap http://pear.php.net/package/Net_IMAP , claiming that the "standard" IMAP class cannot do this, but the Net_IMAP package does not seem to be updated for quite some time, so I am skeptical about it ...
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