Hi. We Run an Exchange 2010 (SP3 RU2) and for a long time calendar sharing is a big problem. Please also note that these mailboxes are linked mailboxes.
The latest is a user has been granted Reviewer permission over a number of other Users mailboxes but they cannot see anything other than Free/Busy information.
If the user sends a Calendar share invite via Outlook they get an error: "The Folder you selected is not available".
These issues also persist in OWA.
Today I have disabled their user account in exchange, removed the resource AD user. Created a new user in the resource, reconnected the mailbox to the new user and the existing authentication AD user. This made no difference. New profiles in outlook makes no difference.
Removing and reading permissions in powershell, makes no difference.
Is there something I am missing?