Outlook: Creating an Add-to-Calendar link in an Email Message
As an alternative to sending out a meeting request, you can add an iCalendar attachment or link to an iCalendar file to an email message – so that when the recipient either opens the attachment or click on the link, the event can be added to their calendar.
Maybe you’re offering a guest speaker and it’s not important to you who attends, just that people know they may attend if they want to. And you’d like to offer them the convenience of being able to easily place the event into their Outlook calendar.
Just remember, unlike when you invite others via a meeting request – if you send out these iCalendar attachments or links, you will not receive any confirmations when people accept or decline the event.
Full tip: Outlook Tip