Published on Brock University (http://brocku.ca)
Brock Information Technology Services recommends that Brock employees do not upgrade to Mavericks (OS X 10.9) if thier machine did not ship with this operating system. The initial release of this OS has known issues and is reported to run slower on older hardware.
If you purchase a new Macintosh system it will come with Mavericks and ITS will support this operationg system.
The ITS Support Team