This still happens on Ubuntu 12.04 (up to date with patches) connecting to an Exchange 2010 server,
using the 'mutt' package, version 1.5.21-5ubuntu2.1. It happens often enough that mutt is effectively unusable. I can post my configuration on request. The mutt in package 'mutt-patched', same version, has the same problem, but additionally crashes.
This still happens on Ubuntu 12.04 (up to date with patches) connecting to an Exchange 2010 server,
using the 'mutt' package, version 1.5.21-5ubuntu2.1. It happens often enough that mutt is effectively unusable. I can post my configuration on request. The mutt in package 'mutt-patched', same version, has the same problem, but additionally crashes.