I don't think they have jumped them. Many builds are internal, possibly on minor issues, which are not in the published sequence. FWIW. This was probably the jump they are referring to. Even a jump back to 99xx just before the last: 10.0.10000.0.fbl_lad.150119-2010 10.0.9925.0.fbl_mobs_dev02.150119-2000 10.0.10000.0.fbl_ie.150119-1730 10.0.10000.0.fbl_photos.150119-1721 10.0.10000.0.fbl_outlook.150119-1721 10.0.9925.0.fbl_enf.150119-1700 As you can see, judging by the titles, they all refer to different branches. - But, we''ll find out shortly.