Outlook appointments disappear from iphone calendar

I have a reoccurring problem with appointments that are set in Outlook that will appear immediately on my iPhone calendar, but when I check back later sometimes the event has been deleted from my iPhone calendar but not from my Outlook calendar.  It's driving me mad.  Some of the times it does this is when I send an invite through outlook for an event to another user.  The event will appear on my iPhone calendar but once the other person accepts my event invitation it will disappear from my iPhone calendar, but remain on my Outlook calendar.  It doesn't do this everytime, but seems to be when I notice this happening the most. 
On my phone settings I have the outlook calendar set as my default calendar.  My iPhone is also synched with two gmail accounts a Hotmail and an icloud account.  The only calendars I actually use however are my Outlook and the the iPhone calendar.
Any ideas?

One of the things I always suggest our users do in a situation like this is check the cache file on the Outlook desktop client.  It has an *.ost extension.  I've found it can get out of date and affect the calendar on mobile devices.  You can turn off caching in Outlook, then delete the cache file, then turn caching on and let it be rebuilt.  Microsoft also has a number of calendaring "best practices" its important to implement.
http://office.microsoft.com/en-us/help/outlook-meeting-requests-essential-dos-an d-donts-HA001127678.aspx
We've struggled with issues like this for a while.  The steps above are good for a starting point.  In addition, you want to minimize the number of delegates, the number of instances of clients running against the Exchange mailbox, and accept all appointment notifications.  If any one notification is deleted, Outlook, in the past, anyway, has deleted the appt. from the calendar even if all other recipients accepted their notification.  Hopefully you receive the notification on your device and accept it.

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