Email to link with email parameter opens outlook in browser starts new email

mailto: works for all users if they have set up default application outlook locally.

<a href="mailto:example@outlook.com">Send Email</a>

https://outlook.office.com/owa/?path=/mail/action/compose&to=emailname@domain.com&subject=Email%20Subject%20Here&body=some+content+goes+here


Link to compose outlook email:

https://outlook.office.com/owa/?path=/mail/action/compose

Pass parameters in URL based on your use case:

&to=emailname@domain.com
&subject=Email%20Subject%20Here
&body=some+content+goes+here