Personal Folder File

Dear all,

Can you please guide me how to recover back the Personal
Folder file (*.pst) that I had accidently deleted from my
local HDD. Last 3 months important corporate e-mail
messages had been lost. Is it anyway to recover it back? I
had tried using the System Recovery in Win XP Pro, but
still fail to recover it back. Please help.

Thank you & have a great day,

Best regards,
Glenn