Acc Compact 

AccCompact is a utility for Microsoft Access database developers and administrators. AccCompact allows the automatic compaction of one or more Access databases simply by double clicking an icon. Database compaction can also be scheduled for a la
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PSTCompactor - Home Edition 

Shrink Microsoft Outlook email PST files up to 38% and avoid the 2gb limit - don't let Outlook corrupt your email. Zip attachments, force compaction, removing deleted content and more! Makes Outlook faster, more reliable and less prone to corruption
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PSTCompactor - Professional Edition 

Reduces Microsoft Outlook PST file sizes up 38% across the Corporate network. Compress & zip attachments, automate compaction, etc. Suitable for management and implementation of Enterprise Email Policies. No Exchange changes or dependancy
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