NetOffice supports extending and automating Microsoft Office applications: Excel, Word, Outlook, PowerPoint, Access, Project and Visio.

Programming language: C#
License: MIT License
Tags: Excel     Office     Word     Ribbon     Interop     Outlook     PowerPoint     VSTO    
Latest version: v1.8.0-alpha01

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NetOffice - Microsoft Office in .NET

Build Status NetOfficeFw.Core NetOfficeFw.Outlook NetOfficeFw.Word NetOfficeFw.Excel NetOfficeFw.Powerpoint NetOfficeFw.Access

NetOffice is a set of libraries for building Microsoft Office Addins and automation of Microsoft Office applications.

Use NetOffice to extend and automate Microsoft Office applications: Excel, Word, Outlook, PowerPoint, Access, Project and Visio.

:rotating_light: Notice: Use official packages with NetOfficeFw.* prefix. Using old 1.7.4 packages? Learn how to migrate.


  • MS Office integration without version limitations
  • All features of the MS Office versions 2000, 2002, 2003, 2007, 2010, 2013 and 2016 are included
  • Active support in version independent development
  • Syntactically and semantically identical to the Microsoft Interop Assemblies
  • No training if you already know the MS Office object model, use your existing PIA code
  • Reduced and more readable code with automatic management of COM proxies
  • Usable with .NET Framework 4.0 or higher
  • Easy add-ins development
  • No deployment hurdles, no registration
  • No dependencies, no interop assemblies, no need for VSTO
  • Visual Studio Project Templates and Wizards available in NetOffice Toolbox

Getting Started

Checkout the NetOffice-Examples repository to see how to use NetOffice to automate Office applications or how to create add-ins to extend them.


The NetOffice Toolbox is a comprehensive toolset to get started with NetOffice solutions.

Project History

You can find more information about [NetOffice Git repository in documentation](Documentation/History.md).


  • master - main branch
  • releases/netoffice_v1.7.7 - branch with current NetOffice 1.7.7 source code
  • releases/netoffice_v1.7.6 - branch with NetOffice 1.7.6 source code
  • releases/netoffice_v1.7.5 - branch with NetOffice 1.7.5 source code
  • releases/netoffice_v1.7.4 - branch with NetOffice 1.7.4 source code

Archived Branches

These branches are archives of the source code from CodePlex and OSDN.

  • import/osdn_repository - branch with NetOffice source code imported from OSDN repository
  • import/legacy_repository - archive branch of original NetOffice source code imported from CodePlex Subversion
  • import/netoffice_1.7.4-alpha - archive branch of NetOffice 1.7.4 source code provided by Sebastian
  • import/netoffice_1.7.4.1-alpha - archive branch of NetOffice source code provided by Sebastian


NetOffice source code is licensed under [MIT License](LICENSE.txt).

Copyright ยฉ 2011-2018 Sebastian Lange
Copyright ยฉ 2015-2020 Jozef Izso

*Note that all licence references and agreements mentioned in the NetOffice README section above are relevant to that project's source code only.