Such as read-only confirm, other alerts. What to do with these popups? Or ignore them?
See my answer here.
Basically, you disable all alerts via the "Display Alerts" method:
Microsoft.Office.Interop.[OFFICE_APP].Application app = new Microsoft.Office.Interop.[OFFICE_APP].Application();
app.DisplayAlerts = false;
where [OFFICE_APP] is the name of the Office program you're using, such as Word, Excel, etc.