All program components required for converting OST to PST must be 64-bit. When converting large OST files (4 GB and above), you will have to use a 64-bit computer system.
Recovery Toolbox for Outlook enables the user to search for data deleted from an OST/PST file and save it to the disk. search for and reading of deleted and old versions of documents is used by police authorities to collect compromising information (Forensic Mode). search for and reading of old versions of documents is used by attackers for stealing users’ confidential information. Note: it is recommended to backtrack the changed options after the export of the recovered data in Microsoft Excel has been completed. In order to optimize disk space consumption and remove old elements, you need to configure the AutoArchive feature in Microsoft Outlook. If Outlook is in active use, the size of the OST file can grow quite significantly, while the actual size of data in the file remains the same. 
The new version of the object is written to a newly allocated space, but the old version remains in the OST file as well. In other words, when you remove or modify a message, contact, reminder or meeting, the object is only marked as removed, but is not removed physically and remains in the OST file. It is impossible to use these blocks to fully recreate the original object, which is why they can be treated as junk.
blocks of data from earlier versions of messages, contacts, files and other objects. old versions of messages, contacts, files and other objects. The analysis revealed the types of data that are not carried over to the PST file after OST file conversion: Our engineers have analyzed the content of OST (source) and PST (destination) files.
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