Use macbook inbuilt microphone with audio going through mic-less earphones I want to buy Sony Earphones for use with my MacBook Pro Mid-2014 edition. The earphones have no built in mic. Can my MacBook play audio through my earphones and use the inbuilt mac microphone at the same time e.g. during skype calls or will I have to unplug the earphones for 2 way communication?

I am using OS X 10.10
Yes, you will be able to use your internal mic and headphones. A useful shortcut is option click on the speaker icon on the menu bar.