outlook 7 with exchange 2003 through vpn

Hello,
On my network, I have some laptop with Windows XP and Windows 7 client using outlook 2007 and exchange server 2003. Protocol used is exchange basic protocol (MAPI ?)..
Within the company, users use outlook 2007 with no problems and exchange 2003.
By the vpn, Windows XP notebooks can connect to exchange server 2003 without problem too.
But the problem is laptops with Windows 7 can not properly connect to exchange server 2003 through vpn. The temporary solution I found is to use IMAP but I wish I could use the standard protocool of exchange.
Please help me
Thanks
simfranceAsked:
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GeodashCommented:
You can use Outlook Anywhere in the client and on Exchange which has worked well for my clients in the past. Read about it here -

http://technet.microsoft.com/en-us/library/cc179036%28v=office.12%29.aspx
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kardell2006Commented:
You can configure Outlook Anywhere on the Exchange Server and within the Outlook clients. When configured properly any client with an internet connection can use Outlook. Also helps fix the annoying relogin prompt boxes.

http://technet.microsoft.com/en-us/library/aa998934%28v=EXCHG.80%29.aspx

Outlook Anywhere server link is under Server Config -> Client Access on Exchange.

outlook anywhere exchange

Make sure that server is setup in the Outlook Client Under - > Account Settings -> Connection ->Exchange Proxy.

outlook anywhere client
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