Takeaway:  Ten popular features that are missing from Outlook 2013.
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Right-click Lookup

Outlook 2013 does not include ‘Lookup’ when right-clicking a word.  This feature is still available:

            1. Open a new e-mail message.
            2. Click inside the message body.
            3. Select the Review tab.
            4. Select ‘Research’ in the Proofing section.
            5. Press [ALT] and select the word or phrase that you would like to look up.  Also, you can type the word or phrase in the ‘Search For:’ box.

Right-click AutoCorrect

Outlook 2013 does not include ‘AutoCorrect’ when right-clicking a word. This feature is still available but will have to be entered manually.  (Right-click Add to Dictionary is still available using a right-click.)

Import/Export Formats

Outlook 2013 only allows .pst (Outlook’s data file format) and comma-delimited data as import formats.  Previous versions allowed many file formats to be imported and exported.

Meeting Workspace

Outlook 2013 does not include Meeting Workplace.  Also, this feature cannot be added to the Quick Acces Toolbar.  Meeting Workplace was a website that supplied Attendees, Date, Time and Location for meetings.

Outlook Mobile Service

Outlook 2013 does not support Outlook Mobile Service (OMS).  OMS let you create and send text/multimedia messages to a mobile device from Outlook, similar to e-mail(s).

Windows Search

Windows 8 does not support using Windows Search to search Outlook e-mail. Previously, you could using Windows Search without opening Outlook to search for e-mail(s).

Calendar Publishing

Outlook 2013 does not support Calendar Publishing; the replacement is Office.com.  Microsoft cut service for previous versions on April 5, 2014.

Drag-and-Drop

Office 2013 does not support “dragging-and-dropping” e-mail(s) in the To-Do bar to create a calendar entry.  You can “drag-and-drop” an e-mail to a shortcut to create a calendar or task entry.

Notes and Journal

Office 2013 supports ‘Notes’ but ‘Journal’ is no longer available.

Suggested Contacts

Office 2013 does not support Suggested Contacts.  Suggested contacts gathers contacts that are not in your list and suggests them.