When Time Matters opens an attachment to an Email, saves on your computers local drive, just like Outlook does. If you open sensitive attachments, take care to delete them from your computer's temporary folder.
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You can share documents securely with clients and others using Time Matters 13 and later. Two aspects of this service set it apart from alternatives: (1) It makes receiving documents really easy for your clients. (2) It allows you to send documents quickly from within Time Matters.
Your best choice is to replace your Windows XP computer with a laptop or desktop running Windows 7, Windows 8 or a different operating system. If you do not replace your Windows XP computer, you should take these precautions.
Beginning on April 8, 2014, Microsoft will no longer provide updates to fix newly-discovered vulnerabilities in Windows XP. While security software vendors will continue to provide updates, those updates will not protect against holes in the Windows XP operating system.
We recommend replacing Windows XP computers before April 8.
This post explains how to disable the Protected View warning for Word documents you open or download from the Internet. That spares you from the annoyance of having to click an Edit button in a warning bar in order to edit a Word document.