The very nature of the way Skype works means it is extremely secure, as long as the users don't mix their personal and work accounts; the major problem corporates have is the natural assumption that something tailored for Joe Public will never be good enough at a corporate level which, I understand, is what you are arguing against but even you have fallen into the same trap assuming that Skype isn't secure without actually knowing!

Similar thing to do with data wiping, corporates (especially banks) all believe that you have to overwrite data multiple times with random strings for it to be unrecoverable and even then they think a super electron microscope can salvage the data and tend to opt for complete platter destruction; this is a complete myth (http://computer-forensics.sans.org/blog/2009/01/15/overwriting-hard-drive-data/) not to mention solid state memory has no remnant at all. Anyway point is there is too much superstition in an industry based on logic and I couldn't agree more with this article, many businesses could save a lot of money if they were open to the idea that solutions don't have to come in a 'corporate' package.