If the thing you want to accomplish is to regain space on your file server, then separately compressing each PST is not a good solution. If you have a Windows 2000 or NT server, you should compress the entire folder holding the PST files. This gives you the best balance of performance and compression.
Right-click the folder holding the PST files and select Properties from the flyout menu. Assuming that you are running Windows 2000, click Advanced then, in the Advanced properties window, select the Compression option.
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