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.
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