Need help re Upgrade path to Exchange 2010

Dear experts,

currently i have DC with Windows Server 2008 R2 and Exchange Server 2007 with CAS,MB and HT installled on the same machine. i have only one firewall which is Cyberoam.

my future plan after upgrade to exchange 2010 is:
-> Total three servers with CAS,HT and MB servers installed on each
->DAG will be used on MB Servers and Hardware Load Balancer (Kemp 2000) will be used for CAS
->TMG will be introduced after Cyberoam (public IP will be on Cyberoam)
->There are two public IP on Cyberoam, one for the internet for the users which will forward traffic on TMG, other will be for Exchange which will forward traffic to Edge Transport Server.
->Two seperate Edge Transport Servers in WNLB in the DMZ (between Cyberoem and TMG)

Q1) i have studied different stuff on the internet but i need to know that what will be steps i.e which one to do first, which one to do second e.t.c.?
Q2) is it enough to route all my public clients (pop3, anywhere,OWA) from Cyberoam to Edge Transport Server or still i have to configure publish rules on TMG?
ISIS_TeamAsked:
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BusbarConnect With a Mentor Solutions ArchitectCommented:
the first thing you will need to do is moving your Exchange data to the new mailbox infrastructure, you will start with CHUM approach which means that you will install HUB/CAS and configure it then do MBX nd move mailboxes.
I think that will give you the time slot needed to configure the stuff
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ISIS_TeamAuthor Commented:
thanx busbar for the reply...so my steps will be:

1) Install CAS Array with HT on all three new servers
2) install Hardware Load Balancer and configure it
3) Install MBX on same servers
4)Install DAG
5)Move Mailboxes
6)Remove Exchange 2k7
7) Install TMG
8) Install Edge Transport Servers and do WNLB

is it ok? and is there any thing special which i have to keep in mind during this whole process
Can you also give me the answer of my 2nd Question please?
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BusbarConnect With a Mentor Solutions ArchitectCommented:
you can install HUB/CAS/MBX single time and configure HUB/CAS and leave MBX later.
TMG and Edge server preferred to be configured before moving users so they can use OWA/Autodiscover and enjoy the new spam filtering.
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ISIS_TeamAuthor Commented:
one last question:
 Is it enough to route all my public clients (pop3, anywhere,OWA) from Cyberoam to Edge Transport Server or still i have to configure publish rules on TMG?
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BusbarConnect With a Mentor Solutions ArchitectCommented:
keep in mind Edge server does only SMTP, other protocols will have to go from TMG to HUB/CAS
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ISIS_TeamAuthor Commented:
thanx busbar for your time and help...will try and hope that everything will go fine :)
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