Developers have been able to customize Office for a long time now; some of us still remember writing Excel macros on Windows 3.1 or automating Word with Word Basic. Thankfully, these days the tools used to write Office solutions are built in to Visual Studio. With them, you can create Office-based projects and solutions that leverage Word, Excel, Project, Visio, PowerPoint, InfoPath, and Outlook. You can also create SharePoint applications following the new SharePoint app model. Your Office apps can be created for desktop installation or as a Cloud Business App in Office 365. Figure 1.5 shows the New Project dialog for Office solutions.