This honestly isn't anything new. We have been able to purchase Microsoft software from the IU bookstore since the Win98 days. It's a deal that IU worked out with Microsoft. Just last week I picked up Vista Ultimate for 20 dollars... only to have it sit, unused for ever and ever and ever, amen.
If your a student, pick this up. While Vista is terrible, Office 2007 is a sure winner. While your at it, don't forget to download the compatibility patch so prior versions of office and it's files can work as they should in 2007, as well as it gives you the ability to open 2007 files in Office 2003.
"It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring."
- Carl Sagan
Intel i7-5960X | ASUS X99-Deluxe | 16GB Crucial DDR4 | Intel 730 240GB SSD | Crucial M4 256GB SSD
WD 1TB Black x1 | 2 x ASUS Strix GTX 970 SLI | Corsair H110 Water Cooler
Corsair 750D | Windows 8.1 x64 | Dell 2410 x 3 @ 5760x1200
Intel E5-2660v1 x 2 | ASUS Z9PE-D8 WS | 128GB ECC DDR3 | WD 250GB | 24TB iSCSI Shared Storage