1 Open Microsoft Outlook. 2  Open the message that you want to save as a file. 3  Do one of the following: 4  The Save As dialog box is displayed: 5  In Outlook 2007 click the Office button, and then click Save As. 6  In Outlook 2010/2013, click File tab and select Save As. Do one of the following: 2  The Save As dialog box is displayed: 3  In Outlook 2007 click the Office button, and then click Save As. 4  In Outlook 2010/2013, click File tab and select Save As. 5  Select the drive and directory in which you want to store the file. 6  In the File name field, type a name for the file.