They state: "Click Best Encryption, and then set a password for your personal folders (.PST) file if security is of utmost concern."
That doesn't address the primary issue with passwords on .PSTs. Any search on Google will yield a number of software firms selling .PST password crack utilities. So, no matter the selection of available encryption -- the data itself is available even if the .PST is password protected.
Particularly sensitive data should be stored in other mechanisms, like an Exchange database -- where you should be guaranteed physical security based on the facilities around the data center security where your Exchange server resides.
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