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Your Home (U:\) drive no longer exists. You should use Microsoft OneDrive for personal files. Group drives will not automatically map onto your device when you login. Instead, you will need to manually map them - please see our guide on mapping your drives:
Mapping a Group Drive
Drive Mapping guides.
Please note you will need to be connected to the VPN to access Network Drives - see our guide on How to connect to the VPN & When to use the VPN
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