Outlook 2010 - Cannot cancel a meeting as the organizer.

Question

On Outlook 2010 I do not have a 'Cancel Meeting' option. I can delete a meeting but the only option is to notify the organizer...  but I am the meeting organizer. I need to be able to cancel a meeting and notify all of the attendees. I currently do
not have (or cannot find) this option!

Answer 1

This happens after activesync. If you disable activesync for problematic user's mailbox, calendar didn't change meeting organizer (cancel, update meeting buttons).
I found that - after meeting organizers mobile phone (nokia) synchronization,
some values of meeting organizer was changed.
You can look and compare organizer values (before and after sync)here:
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rgould5,
There are three MAPI properties that Exchange clients can key off of for determining organizer information.  Here’s a quick summary
of what they are with details on how to inspect them using the  MFCMAPI tool mentioned by Ripu:
1.      
For meeting requests, a Recipient table exists showing each attendee.  The organizer is represented here when PR_Recipient_Flags = 3
2.      
PR_ Sent_Representing_Email_Address and/or PR_Sender_Email_Address
3.      
named prop0x8217 dispidapptstateflags [can also show up as MessageStatus]
if the value is 1 = olMeeting it means you’re the organizer
if the value is 3 = olMeetingRecieved it means you received the item so you can’t possibly be the organizer
In your situation, the organizer seems to be modified on the calendar item in all three users’ mailboxes at the same time.  This
usually means an application that has privileges to each mailbox is the culprit.  Generally, if ActiveSync or an ActiveSync device is contributing to the problem, only the mobile device user’s calendar item would be affected.
The best approach is to inspect which organizer attributes are changed on each person’s calendar item.  Then, with careful repro steps, see if
you can identify the user or service account that is making the changes.  Take a look at the examples below:
Here’s the details of what Recipient Table looks like [requires MFCMAPI available
http://mfcmapi.codeplex.com from a PC with Outlook].  This isn’t a user friendly tool, but it’s very helpful in identifying what’s changed. 
When you first launch the tool, select the menu item
Session, Logon and Display Store Table.
Now select an Outlook profile to login with
If you see
Mailbox - <username> in the list of display names you’re doing good.  Double-click this to launch the next window.
In this window, drill into the mailbox 
MFCMAPI Recipient Table
-To find the appointment you’re troubleshooting, go to the calendar folder underneath IPM_SUBTREE.  Sorting by Subject will usually help get to
item quickest.  Select the item, and Action Menu(?) / and Display Attachment table.    You will see a list of recipients in a new window.  There should be a "3" in the PR-RECIPIENTS_FLAGS columb for the organizer.
- A healthy recipient table - the PR_RECIPIENT_FLAGS indicates whether a recipient is the organizer, or an attendee [this column is actually all the
way to the right ].  When the PR_RECIPIENT_FLAGS = 3, that indicates the organizer.  For example, if the delegate organized a meeting with the manager and E2k7 Native being the required attendees. PR_Recipient_Flag should be 3 for the Delegate. 
If not, then the calender item was modified by something.
- Going back to the calender item,
PR_SENDER_EMAIL  shows Distinguished Name (DN) of the sender.
- Ok.  Back on the calender item, if the organizer is listed as wrong person, look to see the last person to modify the item.  Here’s
where you can find out what account last modified the calendar item.   Look at the Column "Property Names" for row PR_Last_Modifier_Name.  This is the account that last modified the item and is probably the culprit. 
I hope this helps!