You wont get much mileage trying to use the HP 9100 & SME for faxing and scanning.
You need to use the inbuilt Network card and install the HP Director Software on each Windows PC for network faxing & scanning.
You could probably use SME as a Print (only) Server with the 9100 but I am not sure there would be any gains. HP Claim it has an inbuilt Print Server for 15 network users so why work SME harder than necessary.
Like most other HP printer software, its probably full of bloatware too but thats just part and parcel of buying some of the newer HP offerings !