When you connect your Outlook to a Discussion List on SharePoint, it creates a section in Outlook’s Mail tab such as the one shown below.
Unlike your email inbox, you won’t be able to delete or move any posts from the Discussion List, so for those of us who don’t like the bold numbers next to folders, you may want to right-click the Discussion List name and choose Mark All as Read so that the numbers disappear. Then, as new items come in, you will see them there.
You can also send posts directly from Outlook by clicking on New Post.
Just as an email, you can add images and attachments into your New Post.
However, if you want to make edits to your post, you won’t be able to do that in Outlook, so you can do that that by double-clicking on your post to open it, and then choosing Open in Browser.
From there, you can click on Edit Item. Make your edits to the post, and then click Save.
Note – you can only edit your own posts, not other people’s.