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Vote for PSTCompact
PSTCompact Enterprise Edition is designed to compact your PST files automatically. PSTCompact is an easy to use PST compacting utility with features like: compacting hundreds of PST file in circular mode; scheduling PST compacting by group; processing PST files by group; emptying deleted items folder (optional); cleaning sent items folder by date (optional); manual processing option; explores the server for PST files.
PSTCompact: supports all Outlook file formats (97-2003); can be installed on Windows XP Pro, Windows2000 and Windows2003; supports mapped drive PST compacting.