Office 365

Microsoft offers three tiers for businesses. Office 365 Business Essentials allows you to use online Office Apps only (no desktop applications) plus 1TB of online storage per user and a 50GB inbox with email, calendar and contacts functionalities.

Office 365 Business offers Word, Excel, PowerPoint, OneNote, Outlook, Access, Publisher and Lync, with a subscription licence for each user to run them on up to five PCs or Macs at once.