Vista - 2 notebooks 1 server. sbs domain or workgroup. fax forwarding. outlook sync.

hi all,

i've been looking around the newsgroups and still couldn't put all the
pieces together. it looks like i could spend hours reading on the net
and i was hoping maybe i can get some help to figure out what the best
plan of action would be.

i've set up a home network for a client.
she has 2 laptops. one of which she has for one of her employees that
might at future take it home when my client goes traveling, this
computer runs xp pro. the other is the owner's, a vista 64. both these
computers are running on workgroup.

now i've reinstalled her desktop as i suggested it should act as a
server and i've put sbs 2003. i've suggested to stop using winfax as
it's too much of a hustle to install it and now she uses the server
fax. i figured it would offer her more features in regards to
forwarding.

now i was hoping to create a sync between the outlooks to the server
so that will be a good way to back up. that way i don't have to worry
if the outlook is open when i run a scheduled backup and also gives me
another source of backup when she travels with her laptop, just incase
something happens.

there's a few issues i'm not sure about:
1.do you have any thoughts about the change i've made with taking away
winfax and putting the server fax?
2. how do i setup fax forwarding as an email so that when she goes
traveling she still recieves her faxes. i don't want her to keep using
efax, i'd like to use the sbs configuration to forward it to her
email.
3. now this is a big one, should i move her users to the domain? it's
taken me a long time to set up her user on a workgroup, plus when she
goes traveling she won't need the domain. there isn't many security
issues as it's only two users. but i don't want it to get in the way
of outlook sync.
4. would you recommend using the windows backup if it doesn't go over
10gb? would you recommend using incremeantal or just copy everything
over and over again. i ussualy like copying better as it makes me feel
safer that it's all fresh.
5. she complains that her vista is loading a bit too much. her
computer is top technology with lots of ram. i am just wondering if
there's any configuration or software i should consider to boost it a
bit. it's a relatively fresh install of vista ultimate. would you
recommend using system mechanic or only use it if needed? ( my
personal pc has tons of software on it and i'm not sure if it's
because of system mechanic 7 but not long ago i backed up my registery
and it was more then 700 mb. have you ever seen a registery that big?
it used to be just a few mbs i thought.)

sorry for the long letter, thank you very much for reading and i hope
i can hear some thoughts and suggestions.
aaron.