I'm new to VSTO - while within Excel, we would like the user to click on an Excel AddIn icon, to get a template of headings, formulas, colours/fonts, etc. Is it best to create this via a VS2010 "Excel Template" or "Excel AddIn" project?
Note that the populated template will need to contain dropdowns filled with data from the database (which will be transferred thru a WCF service). Also the Excel VSTO client will need to push data back to the WCF service for database updates