I have been able to successfully dual boot a 2011 Macbook Pro with Windows 10 before when OS X still used the HFS file system, but things have obviously changed with how the system boots with APFS.
I understand that Windows will not know what APFS is, and so Bootcamp will not work while using Windows if you want to switch over to OS X by using Bootcamp. However, I have another perplexing issue....or simply curiosity.
When you hold down the option key at bootup, I see a hard disk icon with “Macintosh SSD” - obviously that’s OS X. But I don’t see one for Windows (BOOTCAMP). I see “EFI Boot” instead. If I select that, I boot into Windows 10. So, ok, it works, but why does it not say “BOOTCAMP “ or “Windows”?
Also, if I’m in OS X and I go to the System Preferences and choose BOOTCAMP as my startup disk and restart the computer, it boots into nothing and says there’s no startup disk. So I have to power down and hold option again.
I suspect there’s a nuance or issue with the EFI partition or MBR now that APFS is involved, because I never had this issue before with fresh installs, which this was for both sides - OS X and Windows.
If anyone knows what’s going on, please let me know!