They've recently slashed the cost of Lumia 800's and in Europe they can now be picked up for €200, which is actually a little less than an E7. My daily phone is an E7 and ironically, my wife is using a Lumia 800. She's only interested in Facebook and Whatsapp, so the Lumia is ok for her. For me though, it's useless. Battery life is woeful, the 800 doesn't mount as a mass storage device, you can't even set your own ringtones, you have to use Zune to transfer music to the device, multitasking is terrible, the OS is now as obsolete as Symbian, the list goes on.

I would take the E7 over the Lumia 800, but to be honest, neither device is good enough in today's market. Consider selling the E7 and waiting to see what Jolla bring out, or just use the proceeds to buy a Nexus 4.