Why can saving an OWA 2007 attachment on a client machine be dangerous?

When saving an OWA attachment on a client machine that is publicly available (such as a kiosk, a library etc) the attachment can be exposed to unauthorized users if it is not deleted. There are third party add-ons, such as Messageware AttachView (, which offer secure web access to OWA attachments by converting attachment files into secure web pages for over 300 file formats, providing fast, secure access to attachments without the need for the application on the local computer.

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Will tablet and Smart phone use be a big part of your OWA 2013 deployment?