Unfortunately, Microsoft 365 (whether Outlook desktop, web, or the Dynamics 365 app) doesn’t currently have a built-in “open all attachments in new tabs” button or toggle you can simply activate.
Here’s why and what you can do:
Why there’s no native “open all”
Outlook Web and Desktop treat each attachment as an individual item to preview or download for security reasons.
The Preview feature lets you view them inline one-by-one, but there’s no batch preview built into Microsoft 365.
Even the “Download All” button just zips the files — it doesn’t open them automatically.
Possible alternatives
Here are realistic ways to cut the clicks down for your colleague:
1. Use Outlook Web’s “Download All” + Browser Auto-Open
In Outlook Web, open the email.
Click Download all attachments (gets them as a .zip).
Extract the zip locally.
Configure the OS or PDF viewer to open all selected files at once (multi-select → Enter).
This is still two steps, but it saves dozens of clicks.
2. Use OneDrive / SharePoint auto-preview
If attachments are stored in OneDrive or SharePoint instead of emailed directly:
You can open the folder in your browser and use Office Online preview — arrow-key through multiple files without new clicks per file.
3. Use Power Automate to send all attachments to a single page
Flow can trigger when an email arrives → extract all attachments → save to OneDrive/SharePoint → send the colleague a link to the folder.
In OneDrive, Shift-click multiple files and open them all in browser tabs at once (one action, multiple opens).
4. Browser extension workaround
If your org allows browser extensions:
Extensions like Multi Links (Edge/Chrome) let you drag a box around multiple attachment links and open them all in new tabs instantly.
This works well in Outlook Web and can turn 160 clicks into 2–3.
5. Accessibility tools
For arthritis pain, pairing the above with speech recognition (Windows Speech Recognition or Dragon Naturally Speaking) means they could say “click all links” or “open attachments” without physical clicks.
