Am I correct in assuming there is no limit to the number of years put in a Holiday file?
For example, I could have 2007 and 2008 holidays in a Holiday file used for date calculations.

To my knowledge you are correct, and although I have never seen any detail about size limitations, you might want to contact IB support to ask them (I bet they've been asked before and so should have the info fairly well to hand?)

T

Not sure what the file size limitation is for the file but we have federal holidays from 2000 through 2010 in ours.