The file size on disk is still 2GB as the data has been removed from the PST file, but the PST has not been compacted.A migrate message policy is applied and migrates all the messages to the owner’s mailbox.The initial data size and data size are both the same (1.8GB) as no processing has taken place. A PST file with 2GB size on disk, may only contain 1.8GB data (ie.Once the PST file is discovered, the file size on disk, data size and initial data size are reported.There will be no change to the PST file size on disk at this time (the only way to reduce the file size would be to compact the PST).įor example, if you are using PST Enterprise to migrate messages from a PST to the owner’s mailbox you would expect to see: If you are archiving messages (and replacing the full original email with a smaller message stub) or migrating messages from the PST file to the owner’s mailbox, then the current data size compared to the initial data size will reduce.If the initial data size is significantly smaller than the file size, this indicates the PST contains large amounts of white space.the white space in a PST file by comparing the data size to the file size.When performing PST processing using ArchiveOne Enterprise, Express or PST Enterprise you will notice that these products all report on the initial data size, the current data size and the file size on disk. For more information, refer to the Microsoft Office article Reduce the size of Outlook Data Files (.pst and. The only way to reduce the file size of a PST and reclaim white space is to compact the PST file. If you add more data to the PST file again it will utilize this white space first, before expanding the file size again. If you don’t add any further data to the PST file, then this white space can contribute to a considerable storage cost as the PST file size on disk is considerably larger than the data it holds. If however you then remove data from the PST, the file size will not change only the data size is reduced. However, PSTs created by Outlook will have a file size of 265KB on disk even though they don’t yet contain any data. As you add data to a PST file, it will expand the file size to accommodate the addition of data.
Initially the PST file contains no data when first created. A user may also delete emails they no longer require from a PST file which reduces its data size.Ĭhanges in the data stored in a PST do not necessarily have a direct effect on the PST file’s size on disk.
For instance, a user may move emails from their mailbox to a PST file which will increase the data size. PST files can have data added and removed from them under normal usage.
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