You are eligible to install full Office application on up to 5 PCs, Macs, tablets or mobile phones for free (it costs about HKD 400/yr of subscription).
2. 1TB OneDrive account
You can save your Office files (word documents, excel workbooks, powerpoint presentations) on OneDrive. You can work on those files in others computers without downloading them. All changes are save in OneDrive automatically.
It works like Google Drive. You can use it as a cloud storage.