Get it from the Microsoft Add-in store:

1. Open Outlook on your desktop
2. Look for Add-ins on the right top ribbon
3. Click to go to the Add-in store
4. Search ShareSimple
5. Click Add
6. Click get started and follow the instructions

Open ShareSimple

On your desktop Outlook:

1. Start a new message
2. Look for add-ins on your top right ribbon
3. Choose the ShareSimple icon

From a browser:

1. Start a new message
2. Click the … next to the attachments icon
3. Choose the  ShareSimple icon