pst

Can anyone recommend a bit of software that can recover a corrupted outlook *.pst archive? The pst file is approx 3.5GB I have tried the outlook repair tool with no luck, but see various software tools advertised at varying cost adn am unsure if (a) they work or (b) the best one to buy Many...

Comes as a kit with a set square, some knee pads, a how to guide and a few other bits and pieces. Collection welcome from the Heathrow area.