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HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\PST

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\PST Double click on it and enter 1 as the Value.Type (or paste) PSTNullFreeOnClose as the Name.Right click on PST key and choose New, DWORD.If the PST subkey does not exist, create it.Browse to the appropriate key for your version of Outlook.Press Windows key + R and type regedit in the Run dialog then press Enter to open the registry editor. If you want to force Outlook to return this free space every time that you close Outlook, you can add PSTNullFreeOnClose to the registry. Keep in mind that it can take a long time to compact a large data file. To do this, right-click on the top-level of the data file and choose Properties, then click the Advanced button and Compact Now.

If you deleted a lot of messages and don’t want to wait for Outlook to get around to it, you can recover the free space by running Compact Now. (If you leave Outlook open when the computer is running it will have more idle time to compact the data file.) Because it runs as a background service, it can take days for Outlook to finish compacting the pst file. Outlook will automatically compact the data file when the “white space” reaches 20% of the data file’s size and the computer is idle. Until Outlook recovers this space by compacting the data file, it may be possible to recover deleted messages using recovery software. The space used by these deleted messages is often referred to as “white space”. After you delete messages and other Outlook items then empty the Deleted Item folder, the deleted items are removed from the index so Outlook doesn't display them but they are left in the data file.