Title: Getting Office Documents to Open for Editing in Internet Explorer
Getting Office Documents to Open for Editing (Instead of Read-Only)
Inside Internet Explorer
Microsoft Knowledge Base Article 870853 contains
instructions for modifying a registry key to enable editing Office documents
inside Internet Explorer. According to the article, normally, "when
you open a Microsoft Office 2003 document in Microsoft Internet Explorer,
the document opens with read-only permissions, and you cannot make changes
to the document."
The article gives instructions for how to set the key: