Some more possibilities:

transients
vagrants
drifters
fugitives
migrants
errants
floaters
wanderers
Bedouins
itinerants (from @Kit)

What do you call a group of people that move a lot?
I am building a new testing environment, and in the process I have noticed that the Forefront services are missing from the Service Manager. Is there a way to add these services? This is the first time I have seen these missing. I am a local admin on the server. We are running Server 2008 R2 Enterprise with SP1
