Facebook Chat on Outlook.com seems to have a character limit of 400. It won't let me type any more than that. Was this intentional?

Because this problem extends to my Windows Phone because the integrated messaging app on Windows Phone uses the same system. As a result, I also cannot send messages more than 400 characters from my Windows Phone to anyone who is "mobile" on Facebook

As a side note, Skype integration with Facebook does not have the same problem--there doesn't seem to be a character limit when sending Facebook messages through Skype.