Hi Tony,

You should see the Add to Outlook option when viewing your calendar, click on the Actions button (the ...). If you are on the Email section of your account you won't see this option in the menu.

Hello Tony - sorry to hear you're having trouble with this! I took a look at the placement for this option and you should be able to find it here:

Do you not see this menu option here? I don't see anywhere that this can be disabled for the domain or user, so I am thinking this might be something specific to your environment. Do you have the Global Address List enabled for this domain? Alternatively; is it possible one of your admins edited the CSS to hide this option in your interface? 

Thank you both.   Tony