Some exchange calendar events missing with iOS 5

I'm having difficulties with calendar events that are showing up on Outlook not showing up on the iPhone with iOS 5.  These had previosuly synced fine and been on the iPhone calendar before the upgrade to iOS 5, and only some claendar events aren't syncing correctly.  It appears to be doing this for both one-time and recurring events.  Additionally, new events on Outlook are syncing with the iPhone and new events added on the iPhone are syncing with Outlook.

Try closing all apps completely and then do a reset and see if that helps. To close all apps : from the home screen (i.e.not with any app 'open' on-screen) double-click the home button to bring up the taskbar, then press and hold any of the apps on the taskbar for a couple of seconds or so until they start shaking, then press the '-' in the top left of each app to close them, and touch any part of the screen above the taskbar so as to stop the shaking and close the taskbar.
To reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

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