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AE_JBFlag for United States of America

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Exchange active sync issues for mobile phone users on SBS2003

Users within a department of a business using SBS 2003 with Exchange 2003 are having an issue with their calendar events disappearing.
There are about 10 users within the department, but only the ones who have Exchange mail and calendar on their iphone4 are having calendar issues.  Error in the server logs also shows up for each affected user:

Event 3005
User:  department user with calendar event deletion issues
Description:
Unexpected exchange mailbox server error.  Status code 500.  Verify the exchange mailbox server is working correctly.

Is there a way to safely resynchronize these users?  I believe there is a setting in their OU for enabling and disabling activesync.   Will removing their accounts from their phones and then somehow resetting their connection clear the issue?  They will need the calendars to be re added to the phones as soon as possible as they work out of the office a lot.

Thanks.
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piattnd

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The problem is limited to the 5 users within a 10 user department who use their exchange account on their iphones.  All members of the department share calendars within outlook.  The rest of the 40 person organization does not have any issues, except for one HTC user in another department who does not share calendars, This user has had similar, intermittent, activesync issues in the past.  This being the case, I would not want to rebuild the the virtual directories, since other 10 or so smartphone users on the domain have no issues.

I'll run through options you outlined.
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Alan Hardisty
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Thanks.  I am going to start back at the beginning, starting with isolating the problem to either the phones or the server.  I will run a connectivity test to the phones.  I will also check that the default calendar on the phone is set to exchange.
If any of these settings are out of place I will resolve them before looking to the server.  I will re add the exchange profile to the phones and test calendar entries to, and from, the phones.
If there are still sync errors, I will then focus my attention to the server and Exchange, and continue with the suggestions above.
I re post if I have specific questions at that point.