According to the official Office 2013 blog, Microsoft has decided to remove some features and components from Outlook 2013. This is especially of concern to users of Outlook 2007 or 2010, looking to upgrade to the new Outlook.
One of the impending changes to Outlook 2013 is the removal of the ability of Outlook to import and export legacy Microsoft Office formats, namely Excel 97-2003 ".xls" and Word 97 -2003 ".doc" files. This feature is largely used to import contact information; Outlook 2013 will still continue to support more basic file formats like ".csv" and ".pst.
There is no word from Microsoft if its deprecation policy will extend beyond Outlook to other components of Office like Word or Excel; however, we do believe that this exercise will be limited to less-used features of Office and support for such legacy file format will persist in the more popular components of the software suite. For more information of the other affected features of Outlook, do head over to this link.