I've seen multiple system setups where people connected 3 external displays to their macbook pro retina 13". So I bought 2 Mini-Displayport to VGA and 1 HDMI to VGA adapters. The adapters are working fine, full HD resolutions works great but I cann only connect 2 external monitors. I can use 2 monitors via Mini-DP or 1 with HDMI and 1 with Mini-DP but when I connect all 3 one monitor will keep the black screen.
I read somewhere that I should use active Mini-DP to VGA adapters to use all 3 external screens.
Do you have some experience with this or have another solution?