Issue: Customer is unable to open, run or save an attachment using OWA.
Cause: Customer checked public at first logon to OWA instead of private.
Info: Private setting enables owa users to download and save attachments. Public setting assumes you are in a public workstation that’s unsecure. By so doing, that setting automatically, checks this setting in Internet Explorer, called “Do not save encrypted pages to disk”
This prevents any attachment(word, excel, pdf, etc) from being saved to your computer.
Resolution:
While in IE, go to tools, internet options, security tab, advanced tab, uncheck do not save encrypted pages to disk
Click to see the screenshot
Ex-Shell 
