PstPassword

Nirsoft has another great utility you can download, called PSTPassword. PST archives employ very weak encryption. PSTPassword can identify three passwords which can open a .pst archive. Microsoft did not use a strong MD5 or SHA1 hash value, but instead employed a CRC32 algorithm which can be cracked with more than one password.

Nirsoft has posted a list of 17 passwords which will be interpreted as a CRC value in an Outlook .pst archive:

• eyzVS1

• tHPuT3

• 5J8j84

• EvIoh4

• TGcLo6

• JeX2N7

• 1Rj78C

• nr9VuE

• CNQp0J

• pLMtUP

• O0fc8Q

• NaE3OT

• ArTniW

• z7s4mm

• YUfCxp

• yZUzCu

• 5kfzQx

If the password for your .pst file is one of these, the second time you try to enter the password, Outlook won't prompt you to enter a password.