MY NETWORK configuration

1- ISA2004 Network configuration

2- ISA2004 firewall policy

3- DNS

4- DNS OPTIONS

5- DHCP

6- DHCP OPTION

7- ACTIVE DIRECTORY

8- ISA SERVER ALERTS

- user connecting to internet through isa server
- USERS TCP-IP CONFIGURATION FROM DHCP SERVER
- USERS ACCESS MICROSOFT OUTLOOK
- USERS ACCESS SHARED FOLDER ON SERVER
- USERS NOT JOINED TO ACTIVE DIRECTORY "" WORKGROUP" ONLY
- I CAN CONNECT REMOTELY "REMOTE DESKTOP" TO MY SERVER FROM MY LAN .
* PROBLEMS & ERRORS
- SLOW INTERNET
- IN OUTLOOK CONFIGURATION FOR USERS " INCOMING & OUTGOING MAIL SERVER POP & SMTP WHEN I PUT " POP.XXXX.COM -STMP.XXXXX.COM " USERS CAN'T DOWNLOAD OR SEND MESSAGES , BUT WHEN I PUT THE IP OF " POP.XXXX.COM -STMP.XXXXX.COM " IT'S WORKING I THINK IT'S A PROB IN MY DNS CONFIGURATION.
- I CAN'T CONNECT REMOTELY "REMOTE DESKTOP" FROM OUTSIDE MY LAN .
- CAN'T ESTABLISH VPN CONNECTION TO MY SERVER BUT WHEN I TRY TO ESTABLISH VPN CONNECTION FROM INSIDE MY LAN IT'S WORK .
CAN ANYONE HELP TO CORRECT THE ERRORS IN MY CONFIGURATIONS .
THANKS A LOT FOR HELP