outlook always synced contacts when the iPhone was connected to the PC. it worked perfectly with different versions of outlook 2003, 2007, 2010, 2013 and I believe 2016. I have noticed recently that it no longer updates contacts from PC when it syncs. I have made changes to contacts on the PC and these changes are not being sync/transferred to the iPhone. this was never a problem before. what might be causing this? both the PC and iPhone are up to date with operating systems etc.