I have one network (LAN) hosting two domains, County with Exchange and Social Services currently using GoDaddy hosted email. One of the domains, SS, will soon be moved into the other, County. In the mean time I installed Exchange mail accounts to the supervisors on the SS domain in order to share calanders. In Outlook calendar sharing is grayed out for folks on the SS domain with new Exchange accounts.

From my County PC if I try and share my calendar with one of the new Exchange email accounts at SS, I get an error:

Calendar sharing is not available with the following entries because of permission settings on your network.

When I try and invite one of the SS supervisors, their new email account is found in my address book.

FYI, Forum category and Forum options do not have good options to select for this question. Feel free to move the thread where it belongs.

When I try and invite one of the SS supervisors, their new email account is found in my address book.

Do you mean when adding a recipient to a Calendar Sharing message, you selected it directly from your Address Book? By "Address Book", do you mean the Global Address List or a personal contact folder? Please make sure you selected it from GAL. See: https://support.microsoft.com/en-us/kb/983062.

If above doesn't apply, please also try sharing calendar from within OWA to see if this issue continues.

Please let me know the result.

Regards,

Steve Fan
TechNet Community Support