Office 365's Packages have recently changed, as of 1st of October 2014.
All existing packages are being discontinued and in place the following packages are available.
· Office 365 Business
· Office 365 Business Essentials
· Office 365 Business Premium
All of the above packages with exception of Office 365 Business have Exchange On-line incorporated, which is essentially the functionality that is needed to configure inbound and outbound mail flow to and from our service.