If you start drafting an email in your Outlook, you can use Thread for Email add-in to link that email to a matter, include matter documents as email attachments, or choose matter contacts as recipients. Once you send the email, that email will automatically show in the matter inbox, and replies to your email will come directly to the matter inbox in Thread.

1.) When writing a new email, open the Thread for Email add-in from the top toolbar, and search for a matter that you need to link this email to.
If using Outlook on the web, choose the ellipsis for more options to open the add-in.

Use the pin icon to keep the add-in open for any new email.