Microsoft is increasing device install limits!
If you have an Office 365 Home or Personal subscription, you can currently use Office on one PC or Mac and one tablet. But very soon you’ll be able to install it on all your devices (includes PCs, Macs, tablets, and phones) and sign in to up to five at the same time – that means you can use Office no matter where you are or what device you’re on.
If you have Office 365 Home, you can share your subscription with 5 additional people, and each user gets 1TB of OneDrive cloud storage space and 60 Skype minutes each month for ringing landlines around the world.
Microsoft is rolling this out from October 2nd, 2018, so keep an eye out for notification of when it will go live for your subscription.
More information from Microsoft here.