Sorry that I don't have any easy answers for you, but I do have quite a few questions! ;-)
What version of Outlook are you using?
Can we assume that you are opening outlook on the same PC every time--or are you roaming around the office?
If you are doing it on the same PC, then does it ever stop? I mean, if you open it, it syncs. You go into a different screen, it syncs. Will it eventually stop?
Assuming that it stops, when does it start again--When you log off and back onto the system, or when you close outlook and open it again? What happens if you leave it minimized and go into it an hour later?
Does this only happen to you, or does it happen for different users also?
While I don't have anything that addresses your specific issue, you might check this out to see if it is pertinent to what you are experiencing.
Good luck, and please post back!
By the way--anybody with more of a clue here should feel free to jump in!!! Mudskipper
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Groucho said it best-
"A four year-old child could understand this! Quick! Run out and find me a four year-old child: I can't make heads nor tails out of this!"