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    SubjectRe: Query: Patches break with Microsoft exchange server.
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    Date
    On Wed, 2010-08-11 at 10:46 -0500, Jeffrey Hundstad wrote:
    > Exchange 2010 does not handle IMAP "chunking" (partial message transfer)
    > correctly. Any request after about 1 megabyte of total message size
    > will fail.
    >
    > Thunderbird uses this "chunking" feature to give you a status update
    > while downloading large messages. The IMAP statements are of this type:
    > 11 UID fetch 244477 (UID RFC822.SIZE BODY[]<20480.12288>)
    >
    > When the 20480 is larger than 1MB Exchange "claims" there is no more.
    > Sigh....

    I think the problem is not with the fetching -- the problem is that
    Exchange lies about RFC822.SIZE before the IMAP client even starts to
    fetch the message. It reports a size which is smaller than the actual
    size of the message, thus leading to truncated fetches.

    In Evolution we have a workaround -- we don't just stop when we get to
    the reported RFC822.SIZE; we continue fetching more chunks until the
    server actually stops giving us any more. It's not as efficient (because
    we fall back to having only one more chunk outstanding at a time rather
    than the normal three in parallel), but at least it works around this
    brokenness of Exchange.

    http://git.gnome.org/browse/evolution-data-server/commit/?id=9714c064

    --
    David Woodhouse Open Source Technology Centre
    David.Woodhouse@intel.com Intel Corporation



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