Calendar does not sync via ActiveSync. Mail and Contacts work fine.

I recently started using ActiveSync to connect to my corporate Exchange server. Mail and contacts synchronize properly, but calendar items are not downloaded from the server. The iPhone can write to the calendar by adding a new appointment of accepting a new meeting request. I can also see the full list of calendars in my Exchange mailbox when using the iPhone. Simply put, the calendar items are the only part that's missing.
My IT team has confirmed that calendar items will sync to Windows Mobile devices using ActiveSync.
Here are the steps I've taken to solve the problem:
1. I enabled and disabled calendar using the On/Off slider.
2. I removed and reconfigured the Exchange account on the iPhone
3. I confirmed that all calendar items in Exchange had the Message Class set to "IPM.Appointment"
4. I restored the iPhone to factory settings and used a new test Exchange account to confirm that corrupted calendar items were not an issue.
5. Confirmed that the capitalization of my e-mail address in the Exchange Account Info on the iPhone matches the primary SMTP entry in the Exchange GAL.

Guys, I did a bit of research with my other iPhone/Exchange - buddies and this is what we found out:
1. Friend sends me an calendar event from his PC / Exchange Account
2. Calendar event displays as tentative on both my iPhone and on my PC / Exchange Account
3. I accept the calendar event on my PC / Exchange Account
4. Calendar event turns to "busy" on my PC / Exchange Account
5. Calendar event disappears from my iPhone
6. I double-click the event on my PC / Exchange Account and click "Accept" again
7. Calendar event reappears on my iPhone
Funny enough, this does not happen with all events - it seems to depend on the Exchange server and/or Outlook version in use. For those affected: Is your Exchange Server 2003 or 2007, and what version is the Exchange Server of the person who sent you the event in the first place?

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Please try to collect IIS log and then use "activesync" as keyword to have a search.
Also we can use logparser to analyze the log.
http://technet.microsoft.com/en-us/scriptcenter/dd919274
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Using latest iOS on iPad 2.
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Hi kcpalmer,
Welcome to the BlackBerry Support Community.
Have you already tried doing a clean uninstall of the BlackBerry® Desktop Software and reinstaling it? If not, I would recommend trying that first. "How to perform a clean uninstall of the BlackBerry Desktop Software" http://bbry.lv/HVraPb
Is Microsoft® Outlook® configured to use a .pst file or Microsoft® Exchange?
Thanks.
-FS
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Be sure to click Kudos! for those who have helped you.
Click Solution? for posts that have solved your issue(s)!

Calendar does not sync via ActiveSync. Mail and Contacts work fine.

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