Endnote X2 on multiple computers

I have an academic who is using multiple Endnote libraries stored across three computers - An iMac at work, an iMac at home and a MacbookPro laptop.  The problem is this: If he updates an Endnote Library on one computer, he can’t get it to sync with the same library on the other 2 computers. He has been using Mobile ME as his syncing software but can’t get our IT department to support it. Is there a way to create a ‘master’ Endnote library in web storage space ‘the cloud’ and sync all working versions of the library with that? Is Endnote Web the best solution for this?