The TU/e supports VPN for the local network, i.e., IP-addresses starting with 131.155. To use it from your Mac, create a VPN interface in the Network System Preferences panel with VPN-type L2TP.
Server address: vpn2.tue.nl (previously, this was vpn.tue.nl)
Account name: <your exchange account>
If that doesn't work: TUE\<your exchange account>
User authentication: Password (you may add your password here)
Machine authentication: Shared secret: TUe
Description for OS X 10.10 (Yosemite)