Outlook Calendar stopped syncing with iPhone Calendar

I deleted a recurrent event on my iPhone and this action appears to have confused the sync capability between my iPhone and MS Outlook Calendar.
Outlook still tries to find the recurrent event on start-up even though it is not shown in Outlook Calendar.
More concerning is that new events and changes in Outlook Calendar are no longer syncing with iPhone Calendar. The time to complete the Calendar sync activity is noticeably longer than any of the other sync actions, which suggests that there is a problem.
I have been through the restore routine in iTunes and also attempted to replace all the Outlook Calendar data on the iPhone using the Advanced facility on the iTunes Info tab.
I appreciate that this may be an Outlook issue but are there any other things that I can try to restore the sync capability between the 2 Calendars.
All other sync functions appear to work ok - I have created and deleted Contact data from both Outlook and iPhone and this works fine.
Grateful for any help!

I'm not sure if this will work for you. It seems every time I research a problem, everyone has a different solution that doesn't work for everyone. (I just spent an hour and a half searching for a solution in various forums.) But this one just worked for me.
I went into iTunes, into the Devices page for my iPhone, then to the Info tab. I unchecked Sync Calendars with Outlook. A pop-up appeared saying, I believe (I didn't write it down) "Do you want to delete previously synced calendars on the iPhone" - or words to that effect. Since I hadn't entered anything directly into the iPhone calendar in a while, I clicked Okay. Then I clicked on Apply (lower right corner of iTunes). The iPhone synced, and all appointments disappeared from the iPhone calendar. I then rechecked Sync Calendars with Outlook, clicked Apply, and the iPhone synced once again - and all my Outlook calendar appointments appeared on the iPhone.
This was, I admit, after having deinstalled all Apple software from my PC and reinstalling it. That didn't work on its own (still couldn't sync calendars), but I don't know for sure whether it had something to do with the success of the de-sync / re-sync.
Good luck. These solutions always seem to be hit-and-miss.

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If you are having issues with iCloud Calendar not syncing between your Mac and your iPhone, you may find the troubleshooting in the following articles helpful:
iCloud: Troubleshooting iCloud Calendar
http://support.apple.com/kb/ts3999
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