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Compacting PST files

John Barker	12/27/2014 2:01 PM Every December I archive the year's emails for all the users at one of my clients. After using the Archive utility, I use Compact Now to reclaim the space freed up by the archiving procedure. However, I have found that, apart from taking several hours to run on large (>5GB) PST files, it doesn't always reduce the file size as much as it should. This year I found one user's data was particularly troublesome. The PST file size before archiving and compacting was about 4.5GB - after processing, it came down to 2.7GB. However, if I run a Folder Size query from the folder properties dialogue, it shows the total contents of the folder as a few hundred KB. The first compacting operation took about two hours. I repeated the operation, which completed in a few seconds and made no difference to the file size. I then Exported the entire contents of the compacted folder to a new PST. This took a few minutes and the resulting file size was a few MB - exactly what I would have expected after archiving. I'm now wondering: a) Why the Compact Now process doesn't always seem to work as expected b) Why it takes so long and c) Is Exporting the datafile contents to a new PST (which takes a fraction of the time it takes to compact) a valid substitute for compaction?
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