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Jun 252012

A few people have mentioned the DisablePST registry to me in the last couple of weeks, and wondered whether it had any effect on Enterprise Vault.

The short answer is no.

Read on for more ..

The DisablePST registry key is used to literally stop users using PST files.  They can’t open existing ones, and can’t create new ones.  It doesn’t affect programmatic access.  Here is a Microsoft article which talks about it.




DisablePST DWORD = 1

Remember the 11.0 should be swapped out depending on the version of Outlook.  I was using Outlook 2010 for this example, so I would be using 14.0 as part of the key.

Without it set, my Enterprise Vault client trace looks like this:

20/06/2012 10:11:34.044[2808][H]: [Offline Config] Working Directory: C:\Documents and Settings\jason1\Local Settings\Application Data\KVS\Enterprise Vault\82DFF9917466BB4881DC21D6BC6FDBF3\

20/06/2012 10:11:34.046[2808][L]: ~PVHelper::GetWorkingDirectory: 0x0
20/06/2012 10:11:34.046[2808][H]: DisablePST is not set in the registry
20/06/2012 10:11:34.048[2808][H]:
20/06/2012 10:11:34.048[2808][L]: PVHelper::IsRemoveOVSet: 0x0
20/06/2012 10:11:34.048[2808][L]: ~PVHelper::IsRemoveOVSet: 0x0

And, in Outlook I can see options for PST files:


If I then implement the registry key and start Outlook again then the options for PSTs are gone:



The Outlook Add-in client trace shows:

24/06/2012 18:37:19.627[1972][L]: ~PVHelper::GetWorkingDirectory: 0x0
24/06/2012 18:37:19.627[1972][H]: DisablePST is set in the registry
24/06/2012 18:37:19.638[1972][H]:

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  3 Responses to “DisablePST”

  1. Great article as are all your blog posts.

    DisablePST might not have an influence. But DisablePSTGrow does… as people might not be aware of the difference, the latter one applied by GPO does impact the EV Vault Cache. As part of the policy, the path to the setting is different in the registry.

    The article http://www.symantec.com/docs/TECH54648 describes it nicely.
    This is meant to expand on your point.

    • Gahhh .. great minds think alike !! I planned to :

      a/ Do (another) blog on PSTDisableGrow, and PSTDisableGrowAllowAuthenticodeOverride
      b/ Do a blog on the magic registry key that really cripples things because it compacts PSTs at startup/shutdown
      c/ A summary blog

      All in good time 🙂

  2. I’ve now published a couple of follow-ups to this .. check them out 🙂

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