Besides the IP-rating, you also need to consider that indoor camera sensors have a lower rated maximum number of LUX. meaning long term exposure to (direct)sunlight might damage the sensor.
I've tried different solutions either but were not stable and easy to use, and ended up with NetcamViewer Monitor, which does exactly what I needed. (http://www.netcamviewer.nl/index.php/en/products/netcamviewer-monitor)