You need to allow people I give the permission link to access that file without signing in to MSN.
I give people a link that says "anyone with this link can view" but people are receiving the link and being told they have to sign in to MSN account. They don't have an MSN account so they cannot view the file. Again the permission says "anyone with the link can view" NOT "anyone with an MSN account and a link can view"
The requirement is intrusive and a tacky way to try and get users