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

When opening an OWA attachment, the attachment is cached in the Temporary Internet Files folder on the client machine. This can be dangerous when using public computers because the attachments may be exposed to unauthorized users. There are third party add-ons such as Messageware AttachView ( which offers secure attachment access in OWA. AttachView extends WebReady Document Viewing to support over 300 file formats without the need of the local application.

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