Creating reddit RSS feeds is pretty straightforward. For example, subscribing to
https://www.reddit.com/r/news/.rss will get you all threads in the news subreddit. However, attempting to add such a URL to Outlook’s RSS reader will result in the following error:
Outlook cannot process the RSS content from
https://www.reddit.com/r/news/.rss. The link may not point to a valid RSS source.
Fortunately, the fix is simple – just get rid of the right-most slash (the one before
Outlook will now accept the URL and your subscription will work as expected.