Sender
Make a folder somewhere(Documents, Desktop, H, etc.)and name it contact groups or something you’ll recognize.
Go to the contact, right-click and choose Forward Contact>As Outlook Contact.
Click the drop-down, click Save As and save the the attachment to your new folder.
Navigate to the folder, right-click on it and choose Send To>Mail Recipient.(To be clear, you are right-clicking the folder, not the file inside.)
Send it.
Instructions for recipients
Click the drop-down on the attachment and choose Save As.
Save to a folder or desktop.
In Outlook, click on your People icon at the bottom of the left pane.
Navigate to the location where the attachment was saved.
If you are in full screen, click the Restore Down icon between Minimize and the X at the top right.
Drag the attachment to the Contact folder of your choice.