In need for integration of your existing data store such as SQL or SAP with Ms Office applications? Word templates, such as invoices or work order reports need to be filled with data from your services? You want to take advantage of data visualization in Excel? Office Add-Ins are right choice for above cases and beyond and now thanks to Microsoft's openness on all platforms, Add-Ins are supported on Office for Windows, Office Online (Web), Mac and iPad. It's a technology based on Javascript, therefore most of the work should be considered web development but it has many tricky parts. Being a seasoned web developer and Office applications enthusiast I've developed and published Office Add-Ins on private server for a major company. Now I'd like to use my expertise on future projects.