I often use the XBL website to send and receive messages. I am having a lot of issues (some are different for different web browsers), but regardless they all seem to fail on me.
Google Chrome and Firefox: Almost 99.9% of the time I go to even load my message inbox I get the following message "Oh oh... that shouldn't have happened. It appears you've found a glitch in the system."
For Internet Explorer I can load my inbox and read my messages but when I go to send messages the majority of my messages get blocked with a response along the lines of : "You've exceeded your daily message limit sent to people not on your friends list." despite the messages going to people who are in fact on my friends list.