
To recover the items which are no longer in the index you need to force Outlook to rebuild the index by causing corruption. If the Deleted Items folder contained a lot of messages, Outlook may begin compacting the PST immediately and the items will be deleted forever within a few minutes. Once the PST has 20% "whitespace", Outlook begins compacting the PST. When you Compact a PST, the item is finally removed permanently and the whitespace is recovered, often shrinking the PST by many megabytes.

The space the item takes up is called "whitespace". The item is still in the PST, but unrecoverable because Outlook has no idea where it is without the pointer in the index. When you empty the Deleted Items folder, Outlook doesn't actually delete the items, it just deletes the items' listings from the index. Items are records within the database and there is an index that points to each item. When the method below fails, you may be able to recover the deleted message using a commercial product, such as Stellar Phoenix Deleted Email Recovery, Advanced Outlook Repair or Kernel Outlook PST How Outlook's Deleted Items folder worksĪ PST is a database. If, for some reason, you move items to the deleted folder and change your mind after emptying the Deleted Items folder, you may be able to recover the messages under very specific conditions.

You're better off NOT emptying the deleted folder until you are sure you won't need the messages.

