Disappearing or missing Outlook calendar entries

cyberleo2000 used Ask the Experts™
I have a user who syncs his calendar to four devices, his laptop (using outlook 2010 in cached mode), an ipad, an iphone and a blackberry. He also has an assistant accessing his calendar from her desktop. From time to time the assistant does not see what the user sees in his calendar. Could syncing his mailbox and calendar across four devices be a problem?

Are there any documented issues syncing an exchange mailbox with both a blackberry and an activesync device? I know that BES writes hidden data to the mailbox, does activesync do the same?

The assistant was caching his calendar on her PC, so I turned that off. Also his laptop's outlook profile has been rebuilt and the OST file on it is under 2 GB in size.

I'm guessing its the multiple devices causing conflicts with one another during their sync cycles, but I can't prove it.
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There are known issus with Outlook and Iphone resulting in Appointments disappearing
These are outlined on SlipStick


This article references Exchange 2003, Outlook 2007 and an itunes update released in 2008. I should have mentioned my environment is Exchange 2007, Outlook 2010 and iPhone 4. But thank you anyway.
This might be a shot in the dark, but you can check what amount of time the iPhone and iPad are synching for this users Exchange Account.  

To see this, go to Settings > Mail Contacts and Calendars > Scroll down to the Calendar section.  The Sync setting is how far back the sync will go for events.  

Reducing this time will reduce the amount of time the sync takes and could assist in avoid sync conflicts with multiple devices.

Had a similar event with a user and her calendar and reducing the sync to 2 weeks cleared it up.

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