Another option is to use synchronisation software to keep the two copies of Outlook (the .PST files) in step.
Have a look at Allway Sync - click here - it is free for "moderate personal use". Just be aware that when it considers you have exceeded "moderate personal use", it suggests you pay for the "Pro" version and if you continue to use it, it eventually stops working until your use over the last 30 days falls back to the "moderate personal use" level. A bit cheeky, but a very useful application for sync'ing files over a network.
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