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Update open-old-legacy-formats-protected-view-disallow-editing.md
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microsoft-365/admin/security-and-compliance/open-old-legacy-formats-protected-view-disallow-editing.md

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Many legacy file formats in Microsoft 365 apps, such as older Word, Excel, and PowerPoint files, are prone to memory corruption vulnerabilities. By opening legacy formats in **Protected View**, you can minimize the risk of malicious code execution, while allowing users to edit their content safely.
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When this setting is turned on, legacy file formats will open in Protected View, even if saved in a trusted location. Users can choose to edit the files and save them to a modern file format, but they will be blocked from saving in old legacy formats. In Excel, new external workbook links referencing old legacy formats will return a #BLOCKED error, and existing links will display the last successfully refreshed values but will no longer refresh.
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When this setting is turned on, legacy file formats open in Protected View, even if saved in a trusted location. Users can choose to edit the files and save them to a modern file format, but they are blocked from saving in old legacy formats. In Excel, new external workbook links referencing old legacy formats return a #BLOCKED error, and existing links display the last successfully refreshed values but won't refresh.
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The following legacy file formats will open in Protected View:
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The following legacy file formats open in Protected View:
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- Word 2007 and later Binary Documents and Templates
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- Word 2003 Binary Documents and Templates
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## Use Office Cloud Policy service
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You can make also changes to the policy settings directly using the [Office Cloud Policy service](https://config.office.com/) if you need to modify the behavior -- for example, allowing files in a certain old legacy format to bypass Protected View while continuing to open all other old legacy format files in Protected View -- or if you need to scope the setting to specific groups of users.
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You can make changes to the policy settings directly using the [Office Cloud Policy service](https://config.office.com/) if you need to modify the behavior -- for example, allowing files in a certain old legacy format to bypass Protected View while continuing to open all other old legacy format files in Protected View -- or if you need to scope the setting to specific groups of users.
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The following table contains the settings in Office Cloud Policy service that support this Baseline Security Mode setting. To revert to the default behavior, set these policies as not configured.
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