We tested this on some others users and it works as designed just not this users.
Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
I had her give me permissions to her calendar and when I had her assistant make a new meeting request it showed on mine and her assistants however never showed on the primary persons calendar unless we closed outlook and reopened it.
We do have cache mode enabled on all user mailboxes in the organization so that it will allow them to work in outlook right away without it taking so long to load.
If she hits the update folder button the appt then does update as it should, just not automatically. Managing email signatures in Office 365 can be a challenging task if you don't have the right tool. Remember the synchronization delay between clients and exchange (especially if you have two users who use the same calendar for example, if one user changes some things, the changes does not INSTANTLY appear on the second users calendar) I do not expect it to display INSTANTLY hehe (though that would be nice!
To check this setting, you need to open your Outlook settings. To configure these settings, do the following: Figure 4 shows that Outlook will update the Exchange free/busy information every 45 minutes.
This setting might be set by a group policy to a different time interval.
Figure 1 illustrates the flow of information when Communicator pulls free/busy calendar information from Exchange and Outlook. How Communicator pulls free/busy information Depending on the versions of Outlook and Exchange, Communicator will use one of two different methods to pull the information.
Communicator will pull 8.5 hours of user calendar information from Exchange by using one of the following: The settings used to modify the pull interval depend on your environment and are shown in Table 2.