Duplicate calendar entries

[Konnections]

I just got an EVO for work (my personal phone is a TP2) a couple of days ago. It was setup by our IT department to use Exchange ActiveSync for email, calendar and contacts. My practice has been to maintain all my contact and calendar info on my work phone or in Outlook on my desktop, then sync to my personal laptop and then to my person phone (not a big deal since I do the personal sync about once per week).

So I get everything setup for work, and I then I installed HTC Sync program on my personal laptop and synced. My work Exhcnage/outlook account is fine, as is my laptop, but the EVO has duplicate entries (Exchange shows orange, PC syc shows green). So i can't even use duplicate killer on my laptop and reverse sync. Maddening! How do I get rid of these duplicate entries from the EVO?