mtf1380
Active member
I'm not sure what would happen. I used to have 10TB but when my free office 365 license expired it went away. Even when I renewed the office 365 license, I didn't get the 10TB back. There was a lot of noise when MS decided to go back to 1TB.
I might recommend you using that 1TB with another account so that you are definitely sure of getting 11TB total rather than attempting to activate the 1TB and risk lose 10TB
You should also talk to onedrive support
Thank you