To add a Talkinβ TICO call invitation to your Outlook Calendar (or preferred calendar), follow the steps below:
Windows
Click βAdd To Calendarβ in the call invitation email.
Click on the downloaded file in the top right corner.
You will have one of two options:
A list of your calendars will populate, and you will choose the correct application; see the photo below.

Or it will automatically populate your preferred calendar, as seen in the video below.
Once you're on your preferred calendar, click βaccept β to accept the call invitation.
Check out the video below for reference.
Mac
Click βAdd To Calendarβ in the call invitation email.
Right-click on the downloaded file in the top right corner.
Click βShow in Finder.β
Right-click on the file in Finder.
Click on βOpen Withβ
Choose the calendar to which you would like the invitation to be added.
Click βAcceptβ if prompted.
Check out the video below for reference.
Please note: On Mac, if you click to open before right-clicking the file, it automatically opens to your Apple calendar unless you have adjusted your system settings.