Outlook/iPhone Calendar syncing

I cannot get my iPhone to sync properly with my Outlook calendar anymore. They used to merge data, often creating duplicate entries for items that were on both the calendar & phone. Now, items that were on my calendar are only on my phone. It isn't 100% though because some items remain on my computer.
I've reset the sync history, updated my iPhone software & iTunes software. Nothing is working! I can't even find a place to tell iTunes to merge or replace now that it has been installed. This is a work computer and so I have no access to re-install the software without requesting IT to come and do it for me.
Any answers?

Hi Bob. 
Have you updated to the latest version of itunes/iphone? I ask as am having issues updating as well and before I start banging my head against a brick wall trying to get it all updated to see if it fixes the problem, i may as well find out if it could solve the issue.
Rachael

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