In comments of slide 4 titled "Improving Productivity", which listed the intended features for Windows Vista (e.g., AutoLists, Lists), Sehmi wrote:
Portable User Profile – ability to store PUP on removable media and roam between machines (e.g. USB fob)
I understand that the link to the PowerPoint presentation is not of Microsoft's domain, but the metadata properties of the file themselves—in addition to the included information included therein—strongly indicate that the file is indeed authentic:
EDIT: Link updated.