Can we script the compressing of OST files on users computers

After mailbox cleanups either manually by users or by using archiving software OST files remain large. Couple of questions. If the user does nothing, will Outlook 2010 automatically try to compress the OST file in the background? Read some things that seem
to suggest that once the white space grows to 20% of the total size of the OST, Outlook will start a process that runs in the background to compress the OST.
If this is true, can this value of 20% be adjusted. If it's not true, is there any way to programmatically compress the OST so the user does not have to do it manually, or delete the OST and let it rebuild?

Hi,
There's no such method to change the threshold of 20%, but we can configure Outlook to automatically compact the .pst or .ost every time we close Outlook.
I don’t actually recommend this method, as it can lengthen the time it takes Outlook to shutdown and if Outlook is forced to close during the compaction process the data file could become corrupt. My suggestion is that if the .ost file is not so large,
just leave it alone.
If you are sure you want to do this, you can add PSTNullFreeOnClose to the registry.
Important
This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the
registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry,
http://windows.microsoft.com/en-US/windows7/Back-up-the-registry
Press Win key + R and type "regedit" in the Run dialog, then press Enter to open the registry editor.
Browse to the appropriate key for your version of Outlook, in your scenario it's Outlook 2010, the key is "HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST"
If the PST subkey does not exist, create it.
Right click on PST key and choose New, DWORD.
Type (or paste) PSTNullFreeOnClose as the Name.
Double click on it and enter 1 as the Value.
DWORD: PSTNullFreeOnClose
Value Data: 1 = compact on close, 0 = don’t compact
Although the key name only contains "pst", it also works for .ost files.
I hope the information can be helpful.
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

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