Yes—Outlook attachments can be a major reason your OneDrive storage fills up faster than expected. When you use Outlook with Microsoft 365, email attachments are often saved automatically to OneDrive, especially when sharing files via cloud links. Over time, every attachment you send or receive may get stored, synced, and sometimes duplicated across folders.

The real issue starts when the same attachment is downloaded multiple times, saved in different folders, or backed up again during sync. These duplicate files quietly consume valuable OneDrive space without you realizing it. Large email attachments such as PDFs, presentations, images, and backup files can quickly add up and push your storage limit.

Additionally, Outlook rules, auto-save settings, and manual downloads can create redundant copies of the same file. As a result, users often assume OneDrive is full due to important data, when in reality duplicates and email attachments are the real culprits.

To reclaim storage, it’s important to identify and remove duplicate files created by Outlook attachments. Cleaning up these duplicates helps optimize OneDrive storage, improves performance, and prevents unnecessary upgrades to higher storage plans.

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