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Your solution worked. Thank you.
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If an MS Excel file is already opened and Diane tries to open an excel file from an email attachment the attachment never opens. If Diane closes Excel then double clicks the attachment in Outlook then the Excel file opens.
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If an MS Excel file is already opened and Diane tries to open an excel file from an email attachment the attachment never opens. If Diane closes Excel then double clicks the attachment in Outlook then the Excel file opens.

On Outlook 2013, I tried to open an excel document while another document was open and it won't allow me to open it. How can I have two pages open in OutLook 2013

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

A Document Management System (DMS) is a system (both hardware and software) used to track, manage and store documents and reduce paper. Most are capable of keeping a record of the various versions created and modified by different users (history tracking). It is often viewed as a component of enterprise content management (ECM) systems and related to digital asset management, document imaging, workflow systems and records management systems.