Well, I already had Office 15 Customer Preview installed on my computer provided that I have my Windows Live Account. From the Office 15 Customer Preview official website, you can click on Sign Up button to get directed to the Office 365 Home Premium Customer Preview. You're allowed to install Office 15 Home Premium edition on up to 5 devices. Furthermore, you can access the Office documents on the cloud via SkyDrive technology. Also, you can click on one of the products under 'Explore the Office applications' where I think that you're still directed to Home Premium edition.
Below Home Premium edition part is the 'Services for Business' part. There, you can select ProPlus, Small Business Premium or Enterprise. Professional Plus is for IT Pros, Enterprise is for large enterprise business and Small Business as it suggests, is for small business companies. ProPlus Preview lets you create up to 25 users with 5 installations per user. So this kind of volume licensing method is under 'Per User' so one user can install Office 15 Preview on up to five devices which leaves 24 users remaining. Small Business Premium Preview and Enterprise Preview editions take the benefits of Office 365 Pro Plus edition that allow professional email, shared documents, and HD video conferencing but the Enterprise Preview has extra features like Exchange Online, including archiving and legal hold to fully manage your company's email in the cloud. The Enterprise Preview edition also includes SharePoint Online to manage, share and edit business documents and Lync Online to allow you to conduct meetings and collaborate across remote teams on the network technologically and your team members.
In addition to the new Office 365 split up into new editions and existing editions, there are newer versions of individual products that are separate parts of Microsoft Office such as SharePoint, Exchange, Lync, Office Web Apps Server, Project and Visio. For IT Pros, you can get the new version of SharePoint Server, Exchange Server, Lync Server, Project Professional, Visio Pro for 365 Preview and lastly, the Web Apps Server Preview.
Surprisingly enough, the Apps for Office and SharePoint service is at Developer Preview stage which is similar to when Windows 8 was in Developer Preview stage but it is likely to be for developers.
