opening word attachment

Hi all,

I have been having problem with sending a word attachment to my boss. I have send it using Outlook Express, to numerous receiver, with Word document attach to it.

All the receiver does not voice a concern of opening it, however my boss keep on complaining that he unable to open it. He does not want to save it first before opening, he just want to open it immediately and read it.

Any idea why he unable to open this attachment? By the way, he is using web-outlook to check his email.

Thank you,
SK