Weight Diet for Outlook is a specialized third-party software add-in designed to shrink bloated Outlook mailbox files (.pst and .ost) by extracting attachments, deleting duplicates, and compressing data. When a mailbox gets too large, Microsoft Outlook slows down, takes a long time to load, or triggers “mailbox full” errors.
The utility addresses this issue through a step-by-step optimization wizard. Core Optimization Features
Attachment Offloading: The add-in automatically strips massive files out of your emails and saves them directly to your hard drive. It replaces the bulky attachment with a lightweight local file link inside the email so you can still open the file seamlessly.
Duplicate and Junk Elimination: It scans your database to find and safely delete 100% identical duplicate emails. It also clears out obsolete system messages like out-of-office autoreplies and mail delivery failure notifications.
Cloud Link Sharing: Instead of sending heavy attachments that clog up your recipients’ inboxes, the tool can automatically upload files to integrated file-sharing servers and insert a download link instead.
PST/OST Compacting: Once the junk data and attachments are removed, it manually triggers a hard database compression to immediately shrink the physical size of your mailbox file and restore peak Outlook speeds. Native Alternatives (Built into Microsoft Outlook)
If you prefer not to use a third-party add-in, you can put your mailbox on a diet for free using native Microsoft tools:
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