Perform the following steps:
Double-click on the task in the Tasks window to open a Task window.
Choose Actions -> Forward as iCalendar to display a task information
window. The task information window is an email message window, similar to
the Inbox Compose a message window.
Email and Calendar automatically inserts text in the Subject text box and in the message content area.
Email and Calendar includes the task information as an attachment
to the message.
Type the email addresses to which you want to send the task information, in the To text box. If you want to send the information to more than one address, separate the addresses with a comma. Alternatively, click on the To button. Use the Select Contacts from Addressbook dialog to select addresses.
For more information about the elements in the task information window, see To Send a Message.
Choose File -> Send to send the task information to the specified email addresses.
Choose File -> Close to close the Task window.