You can also manually compact the PST file by following these steps: Outlook automatically compacts its data file, if it contains more than 20% of unused space. This helps compact or compress the large-sized PST file. These options do not split the PST file but move mailbox data from one PST file to the other. Nonetheless, you can reduce PST file size by using Outlook’s ‘Archive’ or ‘Import/Export’ option. However, Outlook does not provide any inbuilt utility or feature to split a large-size PST file. You can manage your large-sized PST file manually by following different ways, as mentioned below:
Also, you must know ways to manage an oversized PST file to prevent it from getting damaged or corrupt in the first place. In case the PST file gets corrupted, you will not be able to access the PST file and its contents unless the file is repaired. An Outlook PST file exceeding the 50 GB size limit is prone to corruption and may result in ‘ cannot open the PST file’ error.
Outlook 2010, 2013, 2016, and 2019 support PST files of a maximum of 50 GB.
