There is one project which is originally created on Visual Studio 2010 and its a VSTO Word Addin project few years back
Now for maintenance i have to work on same project but only Visual Studio 2015 is available on my machine and its showing alert Cannot open this project.
So how can i upgrade this solution so that i can open my project in VS 2015
The error message now i am getting while trying to open the project in Visual Studio 2015 is