Exchange Connections question: Mount points?

During my Exchange Connections presentation on availability and clustering, one of the attendees said that he had been told by Microsoft that he should NOT use mount points on a cluster due to performance problems. (For those of you that don't use mount points, this feature allows you to mount a disk partition in to a folder on an existing drive letter rather than creating a new disk drive letter.)

I have checked with a number of folks at Microsoft as well as some gurus from Dell Professional Services and Collective Technologies and no one has heard of this recommendation being made. Based on what I have found so far, mount points are still good. I'll dig some more.