>I understand that FTP isn't encrypted -- so there is a possibility of "eavesdropping", thus not secure as a transport. Most of the time the reason given for blocking FTP and E-mail attachment is that they don't want unauthorized transfer of data -- with a large focus on protection against virus and malware (they don't want people to bring in software from outside). So how does locking out FTP and E-mail attachments, but still allowing DropBox accomplish this (aside from narrowing the number of avenues)?
Well, if you put it that way... I am pretty sure it doesn't. The same people who block FTP
et al might eventually try to block DropBox (and similar services), once they start noticing.
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)