Why can’t I access "View online" anymore (from an e-mail posting a link to a schedule)? I can only "download" it now.

My work sends me e-mails with daily schedule assignments.  I have always been able to access the link by clicking on "view online" when given a choice between  this and "download".  For the past few weeks, "view online" isn't accessible and I have to download.  Did something change I don't know about?  Thanks.