Attachment Manager for Outlook

Rename, reorder, remove, zip (with optional AES password) and undo changes to a message's attachments before you send it, plus an optional Send Guard that makes you confirm external recipients and attachments first.

Download the add-in file (manifest.xml) version 1.0.0.2

Install

1. Download the file above.
2. Go to aka.ms/olksideload and sign in with your Outlook / Microsoft 365 account.
3. Choose My add-ins → scroll to Custom add-ins → Add a custom add-in → Add from file, pick the file, and confirm.
4. Restart Outlook (or reload Outlook on the web), start a new message, and look for Attachment Manager on the Message ribbon (it may be under the … or Apps menu).

Works with

• New Outlook for Windows, Outlook on the web, Outlook for Mac, and classic Outlook (Microsoft 365) with a Microsoft 365, Exchange or Outlook.com mailbox.
• Not Gmail/IMAP accounts inside Outlook — Outlook doesn't run add-ins for those.
• Send Guard needs a newer Outlook (new Outlook, the web, or a current Microsoft 365 desktop build). Everything else works on older ones.

If your mailbox belongs to a company, your administrator may have turned off custom add-ins. In that case ask them to deploy it for you from the Microsoft 365 admin center (Integrated apps → Upload custom apps) using the same file.

Privacy

Your attachments are processed inside your own Outlook. Nothing about your messages, recipients or files is sent to this website — it only serves the add-in's code. Send Guard's settings are saved in your own mailbox's add-in settings.

Notes

• Applying changes removes and re-adds the file attachments on the draft (Outlook has no rename or reorder command), so try it on a draft first. Undo is available while the pane stays open.
• If you attach files, use Outlook's own Attach File button; the pane picks them up automatically.
• Zip support uses zip.js (BSD-3-Clause).