From: Antonio Radici <antonio@debian.org>
Date: Thu, 27 Feb 2014 17:16:58 +0100
Subject: 603288-split-fetches

A workaround for Exchange 2010 IMAP protocol,
tracked in http://bugs.mutt.org/3459,
already merged in the ubuntu version of Mutt.

Gbp-Pq: Topic upstream
---
 imap/message.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/imap/message.c b/imap/message.c
index 3504be8..4234e22 100644
--- a/imap/message.c
+++ b/imap/message.c
@@ -240,6 +240,15 @@ int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
       char *cmd;
 
       fetchlast = msgend + 1;
+      /* Microsoft Exchange 2010 violates the IMAP protocol and
+       * starts omitting messages if one FETCHes more than 2047 (or
+       * or somewhere around that number. We therefore split the
+       * FETCH into chunks of 2000 messages each */
+      if (fetchlast - msgno - 1 > 2000)
+      {
+        fetchlast = msgno+1 + 2000;
+      }
+
       safe_asprintf (&cmd, "FETCH %d:%d (UID FLAGS INTERNALDATE RFC822.SIZE %s)",
                      msgno + 1, fetchlast, hdrreq);
       imap_cmd_start (idata, cmd);