Go into Outlook 2003 and sort by size. Look at the sizes: Tiny, Small, Medium, Large, Very Large, Huge, and Enormous. At what point did enormous become larger than huge? Why not Gigantic? Ginormous? Probably either decided by one bored dev with a deadline or by a gaggle of program managers over the course of nine months. Decisions like this aren't made any other way.

Maybe its a male(box) thing?

Enormous has 8 letters, huge has 4. Therefore, enormous is larger than huge. In Scrabble, enormous is worth 10, huge is worth 8, so enormous is still larger than huge.

Aha. I knew there was a logical reason.