Add-in

AddIn (Add-In or Add In) is a synonym for plugin - a program that is triggered by a host program allowing third party developers to manipulate or extend the hosting program.

Vsto

Visual Studio Tools for Office (VSTO) is a set of development tools for creating Office automation solutions (add-in or document customization), using .NET and the Visual Studio IDE.



Legacy available users

Example

"However since i know that the add-in is more or less working as is for all users some of whom use excel 2010 and some of whom use excel 2013 and some of whom may explicitly have vsto installed and some of whom may not i d like to be sure that i m not setting myself up for a bruising later on when some features of the add-in stop working for no apparent reason due to changing the setting"

from question  

Implications of ignoring CS1762 ("A reference was created to embedded interop assembly ... because of an indirect reference ...")

"The legacy vsto add-in has more features but it s only available on the outlook windows desktop client"

from question  

Deploying both the VSTO and web Outlook add-ins at the same time

Others

Example

As a former vsto add-in dev you have to rethink the way you design office add-in;a web add-in is no more than a web app using a library office.js to fill the bridge between your logic and the office host

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Implementing App For Outlook

I would prefer to disable it completely on the desktop since there s a vsto add-in that does much more then the js api is even capable of but since i have not found a way to do that so my only option now seems to be make the js version work globally

from question  

Is it possible to utilize sessionStorage on desktop outlook-js addins?

Unfortunately vsto is only a managed wrapper around the office interop libraries so vsto has no more hooks than using the interop libraries;it just makes add-in development much easier with helpers and giving us designer support

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Receiving events when user click Insert Chart in Word

1 the reg entries pointing to it or to the manifest in the case of vsto either aren t there or aren t right;2 the add-in has some prerequisite or dependency that you ve missed and since it s not there the add-in loader is just failing to load the add-in

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Excel Addin not appearing on some machines

I m making outlook vsto add-in that launches wpf window

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Closing WPF hosted in Outlook

Vsto is not designed to support udfs if you really need to have udfs for excel written in c# or .net generally you have some solutions to choose from includes but not limited to;automation com add-in here is a good article about this

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How to Deploy Excel addIn project with user defined function developed in c# with setup wizard?

The comaddin base class makes it a bit easier to create an office add-in and reduce infrastructure code to be more familar with vsto - thats the whole idea

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NetOffice - IDTExtensibility2 vs ComAddin

Note that a vsto ribbon cannot be called by vba code.;and the ribbon is not stored in any document. with ribbon xml in vba and com add-in it s possible to share ribbon controls by assigning them a q id

from question  

How can we create a MS WORD Add-in ribbon uisng Open XML SDK for Office

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