That is probably the difference, I have 2003.
Being retired, I don't use my phone for work except 9 hours a week to track time and some database info. Otherwise, I use it to keep schedule of my Kiwanis meetings, other appointments, and some genealogy stuff I do. That's where my Palm has come in handy all these years (the Centro is my 4th Palm). And that's why I muddle on with the earlier version of Outlook.
But I couldn't pass up the chance to play with the Pearl. Note, I'm not complaining, simply sharing what I discovered thinking it may be of value to some.