How do I change the e-mail address on an Outlook Contact card?

A friend of mine changed his e-mail address, so I updated his entry in Outlook under People. When I create a new e-mail for him, however, and start typing his name in the To field, the only address Outlook offers is the old one. If I accept it, and double-click his name, the Contact card below comes up and it still has the old address (in blue, blurred out). How can I update it to the new address? I can't find a way to do it within the card. Thanks for any tips!

What's the contacts folder?

Where is it located?

In the folder tree with all other folders.

I don't know what version of Outlook you are on (its later than mine, 2010), so can't help with the contact card, but you need to watch out for the 'offered' addresses: Outlook can remember (and stubbornly stick to) old addresses, and you have to actively delete unwanted/outdated ones. When you start to type a recipient address, you should be getting a prompt like so:

If it is an old one, click the X to the right to remove it from Outlooks memory. You can remove the whole list somewhere under Options>Mail>Send.

I’m on Office 365, so I’m using whatever the latest version of Outlook is. It no longer works the way 2010 does; e.g. there’s no “X” for deleting suggested addresses.

Involute said:

I’m on Office 365, so I’m using whatever the latest version of Outlook is. It no longer works the way 2010 does; e.g. there’s no “X” for deleting suggested addresses.

Well, this suggest you should (maybe after a wait) see an 'X'.