In order to enable proper sharing across mailboxes, you should use a mailbox of recipient type 'Sharedmailbox'. Your administrator ...

1. In order to enable proper sharing across mailboxes, you should use a mailbox of recipient type 'Sharedmailbox'. Your administrator can create a shared mailbox by following the instructions from {0}. If you want to go with this approach, click No in this screen. {1}{1}2. Your organization seem to be using a user mailbox instead of a shared mailbox. If you really want to use this mailbox for sharing, we can run additional connectivity checks on this mailbox to check if things are ok. In order to do that, we would ask you for credentials in the next page. If things seem to be fine, we will go ahead and create a new profile for you and add the mailbox : {2} in your profile