Suspended processes are ones that are running in/from the metro interface splash screen. A good way to demonstrate this to yourself is open the Metro version of Internet Explorer then switch to the Desktop. Open Task Manager -> Resource Monitor and you'll see under CPU that at least one (perhaps several) instances of Internet Explorer are displayed as Suspended. If you mouse over the top left corner of the desktop, you'll see the small box that shows Metro IE open, right click and close it and the suspended process will disappear.
If you want to remove the LiveComm.exe for good, go to the Metro screen, right-click the Messaging app and select Uninstall. It will also remove the Calendar app and the Metro Mail app, but for those of us on a Desktop this is likely a non-issue.