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I am 99.9% sure when I set my Exchange 2003 server account up, I had the option to "combine" data - not wipe data out. I happend to choose the "wipe" command because my E2003 account was populated with the data already from outlook 2003.
As for SMS push - I don't do that usually. It is hard on the battery. During work hours, I use a 5 minute sync. As long as you are not on WiFi, it is very battery friendly. It can sync all day and not burn 20% of my juice on GPRS.
On nights and weekends I do use SMS-push because I may only get 20-30 emails on the weekends or weeknights so that means instead of 906 syncs during those off hours (every 5 minutes) I get 20-30. Plus it has the added benefit of waking the device up and turning on the backlight - something that is nice to see when a message comes in off of work hours, but a major pain and battery drain during the day. Unless traveling, I read and answer 75% of my emails at my desk anyway so the syncing is more or less keeping my device up to date.
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