Thank you for reply.
1. How to share :
2. Send the share message
3. The error
I already gave to those 3 recipients the permission as author.
Sorry to show you the images this way, i can't do better.
Ive just deployed Exchange 2010 Sp1 in order to use the task functions, for local network.
I already able to send/receive email and callendar. But it showed error as subjected when following theses steps ...