Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


Exchange OWA Unable to Access Some Calendar Items - Outlook Works OK

Posted on 2012-03-18
Medium Priority
Last Modified: 2012-08-29
I have an interesting seemingly widespread problem with OWA on Exchange 2003.  I have users reporting that some calendar items that were entered using Outlook are not syncing with their mobile device.  

While troubleshooting I found that accessing their mailbox from OWA I was able to see the missing calendar item on the calendar but was unable to open it.  Attempting to open it reports HTTP 500 Internal Server Error - The website cannot display the page.  However, I CAN open the same item in Outlook.  

There are many items in the calendar and only a few are not accessible from OWA.  I am unable to recreate the problem.  The person that enters the calendar items insists that all calendar items are created using the exact same process and all are basically the same structure, i.e. the format of the subject line is basically the same with the same special characters present in all calendar items.  I thought at first the subject line in the offending items was too long and contained unusual special characters such as : and / or \ but many with the same structure work fine.  

I did a side-by-side comparison of the URLS from one good and one bad calendar item and nothing seems to be obviously wrong.

I have opened the bad calendar items with mdbvu32 to see if there was something strange but so far I have only noticed that mdbvu32 crashes a lot.  I did receive the following message when using mdbvu32:

The permission on Mapi_folder - Calendar are incorrectly ordered which may cause some entries to be ineffective.  Press OK to continue and sort the permissions correctly or cancel to reset the permissions.  

Choosing OK shows the delegate permissions on the folder.  Clicking OK on the permissions dialogue reports a message about Deny permissions being assigned and they will override other access permissions, just normal ACL stuff.

Another error I received when opening the calendar item properties was:

CPropDlg::RedrawPropTable() IpEntry->GetProps(): MAPI_W_ERRORS_RETURNED

The only problem is, I received this error when opening bad calendar items AND when opening GOOD calendar items.  So I think these messages may be misleading even though I'm not sure what the errors mean.

My environment is as follows:

Windows Server 2003 SP2
Exchange 2003 SP2
Outlook 2007
OWA with Forms Authentication Enabled
Testing was performed using IE8 from a domain PC on internal network.  Accessing OWA externally exhibits the same errors.  

I'm at a loss.  Can anyone offer another approach to the problem that I haven't thought of?

Question by:JDBTech
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
LVL 31

Expert Comment

ID: 37742636
I don't really have an answer, but since no-one else is responding, I'd suggest you try an integrity check of the DB, in case there are some corrupted items.  You need to do it when things are quiet, though, because the DB needs to be offline.

Here's a description of the parameters to supply, but don't use the -fix one first time round.  You may need to think about how important the appointments are before you expose everything else to this sort of risk.

Author Comment

ID: 37748459
Thanks for the comment LeeDerbyshire.  About a month ago I took the database offline and ran an integrity check.  The database checks out clean.  :(

I'm not sure where to go from here.  I have to find out why some calendar items can't be opened with OWA (even though they show up on the proper day with the correct subject) before I can attempt to determine what caused the problem.  

Maybe there is someone that knows more than I do about the internal properties of an Exchange calendar item and could tell me which property OWA uses to access the item??  I thought it was just the subject line represented in a url like the following:


Is there a specific property on the calendar item that represents the URL?  I couldn't find it with mdbvu32 but there is a large list of properties.  I could have missed something important.
LVL 31

Accepted Solution

LeeDerbyshire earned 1500 total points
ID: 37748563
You have the correct URL, but it can be used in different ways.  Used in a GET request, you will get the OWA GUI display for the item.  Used in something like PROPFIND (as sent by a webdav app), you can use the URL to access properties.  It's also possible that the data is okay in the store, but the access method (OWA in this case) is upset by some aspect of it (a confusing recurrence pattern, say).  You might try something like Outlook Spy as yet another way of inspecting the values that Outlook sees.  It will show errors for individual properties if any are returned.

Author Comment

ID: 37748730
I'll take a look at the offending calendar item with outlookspy and see if anything shows up.  Opening the item from Outlook 2007 works fine and it never reports anything weird but maybe I can see something mdbvu32 didn't see.  I'll report back asap.  Thanks again!

Featured Post

Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes clients can lose connectivity with the Lotus Notes Domino Server, but there's not always an obvious answer as to why it happens.   Read this article to follow one of the first experiences I had with Lotus Notes on a client's machine, my…
We aren’t perfect, just like everyone else.  Check out the email errors our community caught and learn the top errors every email marketer should avoid.
how to add IIS SMTP to handle application/Scanner relays into office 365.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Suggested Courses

721 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question