Create a meeting
Add an event with attendees.
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On Calendar, press Create Event.

Create Event. -
Give it a Title, the Date and the start and end times.
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Choose the Client it is about, if any.
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Tick the Colleagues who attend, and add Client attendees from the client’s contacts.
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Set Visibility: Visible, or Hidden: colleagues who are not invited see only Busy, with no details.
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Add Notes and press Create.
The meeting appears on the calendar of everyone invited. Open it to edit it, or to delete it with Delete Event.