ViEmu/Word & Outlook:

vi-vim for Office

Vi/vim editing for your word processing

ViEmu for Word and Outlook is an innovative new product that provides vi/vim emulation for document processing in Microsoft Word, and for mail composing in Microsoft Outlook.

ViEmu for Visual Studio is compatible with Microsoft Word and Outlook from Office versions 2002 (XP) to Office 2016. When using Outlook versions 2002 or 2003, ViEmu only works if Word is configured as the mail editing program (it doesn't work if you use Outlook's internal RTF editor). Since this setting is on by default if you have Word installed, it's most likely that you are actually using Word for all your mail editing. Since Outlook 2007 and newer always uses the Word engine for editing, this limitation is not present with recent versions of Office.