When OpenVPN Connection established, all other Internal Network Connections get dropped

When Users Connect to outside the internal Network using Open VPN all internal Connections get dropped ( no outlook etc available).

how can i change it that users can connect to the outside of the internal network AND using paralel the internal services like shares etc.
Movie Stars

Solution: When OpenVPN Connection established, all other Internal Network Connections get dropped

As an adendum to this see the OpenVPN docs page:

http://openvpn.net/index.php/documentation/install.html?start=1

Particularly the Notes -- Setting TAP-Win32 address/subnet automatically via DHCP

"The problem with getting addresses for VPN clients via DHCP is that you only want to get the IP address and subnet mask, not the gateway. Therefore in a bridge situation, a DHCP server must be able to differentiate between local clients and remote VPN clients."