  In the context of the MiMeS survey of magnetism in massive stars, 85
classical Be stars were observed in circular polarization with the aim of
detecting magnetic fields at their surfaces. No direct evidence of such fields
is found, in contrast to the significant rate of detection (5-10\%) in non-Be
B-type stars. In this paper we describe the sample properties, the methodology
and the data quality. We describe a novel method, previously applied to Herbig
Ae/Be stars, that allows us to infer upper limits on organized (dipolar)
magnetic fields present in the photospheres of our targets. We review the
characteristics and robustness of this null result, and discuss its
implications.
