Are you sure you're talking about Outlook Express and not Internet Explorer?
In IE, right-click on the one you want to rename, click Rename and change it.
You can then sort by name if you wish to re-order them.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
An overview: What leading creative agencies are doing to improve diversity
New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.