"Video No Longer Available"

Hello - I have a 10.5.5 Mac Book Pro - I created a short video in Final Cut and uploaded it to my blog. I copied and pasted the link and sent in an email to another person, who also has a Mac Book Pro. He replied to my email saying that when he clicked on the link and tried to play the video, he got a quick msg. where the video was supposed to be, saying 'Video No Longer Available', then it opened up a pic that I had also put on the blog. I then clicked on the link in his email that I had originally sent to him, and sure enough, it did give that msg., and it did 'rest' on a phot. I instructed him to paste the link his address bar, which he did and the same thing happened, and it also happened again when he tried Googling the blogpost address. Incidentally, everyone else I've sent the link to is able to open and view, both on a PC or a MAC.

My question is, why wouldn't he be able to view this, and why when I clicked on the link that I sent, why wouldn't I be able to view? I can indeed view it perfectly if I just go to the blog, or Google it. He said that all of his software is updated, and that he has the latest version Quicktime. Many thanks!