I need to migrate a SP2010 farm to SP2013. The old sites layout were customized to fit our company website style. After test migrate to sp2013, I found that all layout change to the default style.
By reading this article, it seems I need to re-create a new Master page. I am not a designer. It seems impossible for me.
My question is, is it possible to make the ugpraded site stay in SP2010-mode forever? In this way Microsoft still support this sites? Thanks.