Since r668, IE's AJAX calls have been broken (at least for us). I didn't notice this until I updated our main RC install the other day, which hadn't been updated in several weeks. One of our (very few) IE users called yesterday and said it sat there saying "Checking for new messages..." and never went back to normal.
In r668, there is now a check in index.php for a roundcube-specific header, but this check isn't working with IE7. This is, apparently, because IE7 is forcing the header name to lowercase (verified via tcpflow)
This small patch fixes the issue for me. It adds a check for an all-lowercase version of the header.
Jim
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