Outlook 2010 - Updates To Meeting Not Reflecting on Invitee's Calendar

Question

Hello -
Our environment is Exchange 2007 with Outlook 2010 client. Our executive assistant has full access permissions to our CEO's Exchange account and handles the calendar among other things. For some reason, when she creates a calendar event then makes changes
to it or deletes it, the changes do not reflect on the calendars of the invitees. I verified that she is following the correct steps to create/update events but the problem persists for some recipients; not all. 
If someone could offer some guidance about what might be root cause, I would greatly appreciate it.

Answer 1

Hi,
According to your description, I understand that the meeting updates which is sent by the user who has full access permission to CEO’s mailbox can’t update some attendees’ calendars.
Please check whether there is any user using third-party devices to manage Calendar. If it is, please disable it. We can try to remove full access permission to CEO’s mailbox and add it back to have a try. If it fails, please consider to add the executive
assistant as a delegate for CEO. To do it, please following these steps:
1. Open Outlook in CEO’s computer, click File > Account Settings > Delegate Access.
2. Click Add to select the assistant, and Delegate Permissions for assistant window appears.
3. CEO can set folder permission for assistant and check “Delegate receive copies of meeting-related messages send to me”.
4. Click OK to finish settings.
Then check whether the issue persists.
Regards,
Winnie Liang
TechNet Community Support