Microsoft Outlook has gained the option to block external images in emails. While this might seem like a minor tweak, it can be helpful for privacy-minded users, as images can be used to track whether emails have been read — valuable information for spammers.
Here's the changelog:
All of our weekly updates also include performance improvements and bug fixes to make Outlook better for you
Incidentally, Gmail started showing images by default years ago, but circumvents potential privacy concerns by using proxy servers.