Excel can be downloaded from the Microsoft Office products page as part of a trial of Office 365. The trial is good for one month, after which point users may subscribe to Office 365 for $6.99 per month for the Personal edition.
The Office 365 trial packages several other features with the free trial of Excel. These include other Microsoft Office applications, such as Word, Outlook and Access. The trial also comes with 60 free Skype minutes, good for calling in up to 60 countries internationally. Users who pay for Office 365 also gain access to 1 terabyte of cloud storage space through OneDrive.