>Do you mean the content of all message folders cannot be greater than 65K?
I think he meant 65000 folders - the number of folders, since that was what you asked about. The total size of even a single folder will quickly exceed 65 KB, or even a few MB, even with a few messages.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)