User has no connection on shared calendar.

Question

I've checked the countless threads on here that are related to this, but to no avail. Here's the issue.
I've got a user who accepts a shared calendar invite. When viewing the calendar, it shows up as "No connection." The user is otherwise able to view other calendars, send/receive mail, and other users can view the No connection calendar.
No problem updates are installed. 

Answer 1

Hi,
Is the user able to view the shared calendar on OWA?
If the user is still not able to view the calendar on OWA, please check if the permission has been removed.
Let the owner right click on the calendar, Properties, Permissions, check if the user's name is listed. If not, re-gain the permission to the user.
If the user is able to view the calendar on OWA, try the following steps:
1. While Outlook 2010 is running, hold down the CTRL key, right-click the Outlook icon in the notification area, and then select Test E-mail AutoConfiguration.
2. Verify that the correct e-mail address is in the box next to E-mail Address.
3. Clear the check boxes next to Use Guessmart and Secure Guessmart Authentication.
4. On the Test E-mail AutoConfiguration page, verify that the check box next to Use AutoDiscover is selected, and then click the Test button.
Any error?
We may fix it by reset autodiscover, refer to the link in which there's a user who had the same issue, you may find useful information:
http://chicagotech.net/msapps/outlook13.htm
Hope it helps.
Regards,
Melon Chen
TechNet Community Support