BusyCal allows you to schedule meetings with others by adding attendees to an event and sending a meeting invitation. If the meeting is created on an iCloud calendar, the invitation will be sent by the iCloud server from your iCloud email address. If the meeting is created on a local calendar or Google calendar the invitation will be sent by your mail client from your default mail account.
When you create an event and add attendees to it, a Send Invitation button will appear. Clicking this button will send a meeting invitation to the attendee.
When an attendee receives an invitation, BusyCal will display a dialog asking which calendar to add the invitation to.
The attendee can then Accept or Decline the meeting by clicking the appropriate button in the info panel, and an accept/decline reply will be sent to the meeting organizer.
BusyCal requires you to have a default email address defined in your Address Book Me Card for sending and responding to meeting invitations. You may open your Me Card by launching Address Book and selecting Card > Go to My Card.
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When you receive a meeting invitation via email, BusyCal determines whether or not you are a valid attendee by comparing the attendee email address in the meeting invitation with the email addresses in your Address Book Me Card. If BusyCal finds a matching email address in your Me Card, it will allow you to Accept or Decline the meeting request.
The creator of a meeting is the Organizer. Only the meeting Organizer can edit a meeting; attendees have read-only access. BusyCal determines whether or not you are the meeting Organizer and can edit a meeting by comparing the Organizer email address to the email addresses in your Address Book Me Card.
When you create a meeting in BusyCal, your default email address is used for the Organizer. You may change the default Organizer email by selecting BusyCal > Preferences > Advanced, and choosing one of your email addresses from the Meeting organizer email popup. You can select any of the email addresses in your Address Book Me Card.
Note: Your iCloud email address is used for the meeting Organizer when a meeting is created on an iCloud calendar.
BusyCal sends meeting invitations from the default mail account in Apple Mail. You can set the default account in Mail by selecting Mail > Preferences > Composing, and choosing an account from the "Send new messages from" popup.
You may view outgoing meeting invitations in Mail before sending them. This may be useful for adding a personal note to the email or to change the mail account the invitation is being sent from. To configure this setting, open BusyCal > Preferences > Advanced, and check the "Show outgoing meeting invitations in Mail" checkbox.
Note: Meeting invitations created on iCloud calendars will be sent from the iCloud server as opposed to your Mail client, and will not be displayed before sending.