I have no interest in syncing my iPhone (personal phone) with my Outlook calendar (work), and so everything on the Info tab of the iPhone's sync options is unchecked. This has been the case for years. Over the past 6 months, I have started to notice some odd behavior with my Outlook calendar: recurring meetings vanishing; reminders for old (some VERY old) appointments suddenly popping up again. It seemed to happen inconsistently and at random, until I finally realized that it happened right after I sync my iPhone. Finally confirmed it without a doubt today. I sync my iPhone, there are no messages about any data on my computer being changed, no messages about any calendar or contact info being synced, and the sync appears to finish as normal. "You may disconnect your iPhone" or whatever the "I'm finished" message is appears. Shortly after, Outlook starts to churn. Reminders start popping up, and I noticed that 4 processes are pegging the CPU at 100% with approximately the following ratios: iTunes.exe 50% com.apple.Outlook.client.exe 25% lsass.exe 20% OUTLOOK.EXE 5% Obviously, my intention to NOT sync is not working out. This has caused serious issues for me... missing meetings that you call is not a great business plan. Any and all tips or hints on how I can get iTunes to STOP talking to Outlook completely would be greatly appreciated! I have an iPhone 3GS running iOS 4.2.1, iTunes 10.1 (I think... can't check, as its busy scrambling my Outlook and unresponsive...), and Outlook 2010. This problem was happening far enough back (before I recognized the cause) that I was still running iOS 3.1.2 and some 9.X version of iTunes.