Internet Explorer - Open pop-ups as tabs

To get IE (7, 8, ...) to always open pop-ups in tabs, and not new windows, do as follows:

1. Click Tools > Internet Options,
2. On the tab General, under Tabs, click Settings,
3. Under When a pop-up is encountered, select Always open pop-ups in a new tab, and click OK.

This was usefull for me when working with Microsoft CRM 2011 online.