Recently, I had an issues with the RSS Feeds in Outlook synchronizing with the machines common feed list. Normally, this isn't an issue but when I connected Outlook on two workstations to the same Exchange Account that had a couple of RSS Feeds configured. I would read several of the posts on one workstation. Later, when I was on the other workstation, the feeds would show up as non-read again. I configured Outlook on both computers to stop synchronizing the RSS Feeds to the CFL and the issue went away. To disable RSS synchronization, open the registry editor and add the following or create a text file ending in “.reg” and the double-click to import:
Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Options\RSS] "SyncToSysCFL"=dword:00000000