Here’s some information from Ryan Peat with e-Academy (the company that manages the purchasing site & offerings at onthehub). I hope this clears up some of the misunderstanding.
Staff & Teachers that have a PC assigned to them at work or in their classroom are eligible to purchase a copy of the version of Microsoft Office (currently Office 2010 Professional Plus) and/or the Microsoft Operating System license (currently Windows 7 Professional) for working at home at a cost of $10.99 per license. Legally the end user cannot use the work at home software for personal usage as it is intended for the user to have access to the media for work at home only.
Essentially Microsoft allows any staff or teachers, who specifically have their own computer provided for them by the school or district for use at work, to optionally purchase a copy of the software that they use at work, at home. Licenses acquired by schools or districts via the Academic Select and School Agreement programs are eligible.
The software must be used for working at home, and must be uninstalled if the staff member or teacher no longer works for the school or district. Cross versioning is allowed; for example, if you have Office 2007 on your work machine you are eligible to put Office 2010 on your home machine if you so desire.
If staff/teacher require Microsoft Office or Microsoft Windows 7 software for personal usage they may purchase them at prices lower than off-the-shelf prices at most retail stores, currently around $66 for Office and $63 for Windows 7.
Software can be purchased from http://kde.onthehub.com. Employees and students are permitted to purchase only one license per product available.