You may get the following error in Outlook with RSS:
Task ‘RSS Feeds’ Reported Error (0x800c0005) ‘Unknown Error 0x800c0005’
Unknown Error 0x800c0005 is caused by the website giving the RSS feed – it means that the feed isn’t available. This can be because the server hosting the website is too busy to serve the request or because the website or RSS feed is down.
There is nothing you need to do to stop Outlook from reporting Unknown Error 0x800c0005, it will be fixed by the website owner.