Hey there, Linda.
I'm a bit confused, the title left me with the impression that you can't open a hard drive. Is the problem with Windows 10 apps? Would you be so kind as to give a bit more info regarding the issue?
If you are having a problem with outlook, perhaps it would be a good idea if you could contact Microsoft's customer support for more info.
I'll be awaiting more details.
Boogieman_WD