How to rename attachments in Outlook window without saving?
Renaming an attachment directly within an Outlook email can streamline your workflow, especially when dealing with numerous attachments. Although Outlook doesn’t provide a direct way to rename attachments without saving them first, there is a feature of Kutools for Outlook can use. Here’s a step-by-step guide on how to rename an attachment in Outlook without having to save it to your computer by using the Rename feature of Kutools for Outlook.
Easily rename attachments in email without saving to disc with Kutools for Outlook
Easily rename attachments in email without saving to disc with Kutools for Outlook
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1. After installing Kutools for Outlook, please select an email which the attachments you will rename, and then click Kutools Plus > Attachment Tools > Rename All.
2. In the Attachments Rename dialog box, you can see all attachments' name of selected email are listed in the Name column. Please double click an attachment name to edit, and then click the OK button to save the changes.
Tips: You can modify all attachment names or just modify any one of the attachment names as you need in the dialog box.

Then attachments are renamed in the selected email window.

Note: You can rename a certain attachment by selecting it in the Reading Pane, clicking Kutools > Rename, in the rename dialog box, typing a new name in the Name box and then clicking the OK button to save it. See screenshot:

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