By Wilson Rothman and Joanna Stern Windows 10 is a welcome upgrade for PCs of all ages, not to mention a temptation even for those who strayed to the Mac during Microsoft’s darker times. But there’s one key area where it falters in a big way: core apps and services.Ever since Apple launched iLife—included software for handling music, photos and videos—people just expect that their computers come with such apps, free of charge.