Can anyone explain me why it is impossible to remove the message in some cases? My situation is as follows. For some tests I changed my system time rathe far to the future and accidentally answer to my friend in the chat. And now, with the normal time setting, I have this messge permanently on the top in the chat (so my current posts are inserted somethere in the middle on the thread). I need to remove that message but the (rclick mouse) context menu doesn't contain "Remove Message" item. The "back to the future" trick didn't help.
I actually found the solution myself. I manually edited the SQLite database that contains the messages. See http://community.skype.com/t5/General-Discussion/D