Windows

1. Open Outlook on your Windows machine.
2. Navigate to the calendar and click on the Zoom meeting you want to change.
3. Click Edit
4. Delete the Zoom meeting link and details.
5. On the ribbon, look for the Teams Meeting button.
6. Click on the button and it will turn blue. This will transform your meeting into a Teams meeting by inserting the appropriate link and details.
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7. Save the changes.

Mac

1. Open Outlook on your Mac.
2. Go to the calendar and select the Zoom meeting that you want to change.
3. In the editing mode, delete the Zoom meeting link and details.
4. At the top of your screen, find the Teams Meeting button.
5. Click this button to turn this appointment into a Teams meeting. 
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6. The Teams meeting link and details will be automatically inserted.
7. Save the changes.

Series of Meetings

For a Meeting Series that has been Created you can do the same Exact Steps as above. In Zoom it creates a New Meeting ID for Each Meeting but for Teams it will always be the same exact meeting. So as long as you follow the steps above and Edit out the Old Zoom Meeting Information and then have it attach a Teams Meeting to the Entire Series then it will cover it. Just ensure that you are Editing the Entire Meeting Series and Not just the Single Occurrence.