I tried Missing Sync for a week when 5.0 came out and was unable to get it to work reliably. After spending too many frustrating hours on it, I gave up and went back to the Palm Desktop (which works flawlessly and quickly, but requires I use the Palm Desktop.) I found support to be only marginally helpful. Part of the problem for me seemed to be the size of my data files-- e.g., over 7500 datebook entries. I also found the sync process to be unbelievably slow when it did occasionally work (w/ USB). I am about to upgrade to a Macbook Pro and am considering trying Missing Sync again. Are others with large multi-year datebooks having success? Thanks for any advice you might have.