Sony has been making a lot of changes lately, not the least of which being the new Xperia Z4 tablet the company announced at the Mobile World Congress this year. Designed to compete with Apple's iPad Air 2, the Xperia Z4 is designed to do a lot more: in light of the VAIO laptop line being discontinued, Sony needs a tablet with the power and persuasion to engage business … [Read more...] about Sony Replaces VAIO With Ultrathin Xperia Z4 Tablet