When You auto deploying Microsoft Forefront Client and on some computers installation fault. You should view log files on this computer \\computer name\c$\Program Files\Microsoft Forefront\Client Security\Client\Logs\Clientsetup.txt
Same examples from one computer:
2008-10-23 21:10:21 Microsoft Forefront Client Security (1.0.1703.0) — Installation started
2008-10-23 21:10:21 Hardware requirement check passed.
2008-10-23 21:10:21 OS requirement check passed.
2008-10-23 21:10:21 [...]

I installed Active Directory same time ago. Client have two office than I installed two domain controller and make two sites.

After promoted second server DC2 to domain controller I found some errors in event log:
Event Type: Error
Event Source: DCOM
Event Category: None
Event ID: 10009
Date: 2008-10-20
Time: 16:44:06
User: N/A
Computer: DC2
Description:
DCOM was unable to communicate with the computer dc1 using any of the configured protocols.
Event Type: Error
Event [...]

You can see this error when You run nslookup:

C:\ >nslookup
*** Can’t find server name for address 10.10.10.5: Non-existent domain
Default Server: UnKnown
Address: 10.10.10.5
How to resolve this error? You must simple configure Reverse Lookup Zones and PTR record in DNS.
Click – > Start -> Administrative Tools – > DNS
Click right button -> Reverse Lookup Zones [...]

Exchange 2007 Enterprise Edition supports up to fifty storage groups, one storage group support up to five databases.
Exchange 2007 Standard Edition supports only five storage groups, one storage group support up to five databases.
If You are using Continuous Replication technology Microsoft recommend use one database per storage group.
Exchange 2007 Enterprise Edition supports up to fifty [...]