Outlook add‑in · Microsoft 365

Unlock new abilities for your inbox.

Merge threads, share selectively, prove authenticity & forward like never before, all without leaving Outlook.

Runs inside Outlook. Signs in through your own Microsoft 365 tenant.
Outlook & Microsoft 365 native SHA‑256 verification Azure AD single sign‑on Every share audit‑logged Hash‑only storage
How it works

Three steps, all inside Outlook.

No new inbox, no portal to forward into. Nootro lives in the compose window you already use.

01 / Compose & control

Merge a thread, redact the rest

Pull two threads together or forward one. Strip out what stays private, & decide exactly what each recipient is allowed to see.

02 / Send with a seal

Fingerprint, then send

Nootro takes a SHA‑256 fingerprint of the message & embeds a verify badge before it ever leaves your outbox.

03 / Recipients verify

Proof, on their side

Anyone who receives it can confirm on verify.nootro.ai that the content is authentic & nothing was changed in transit.

What's inside

Controlled sharing, with proof built in.

Controlled disclosure

Decide what each recipient can see & redact everything else. The thread leaves your outbox showing only what you chose.

Cryptographic verification

Every share carries a SHA‑256 fingerprint your recipients can check independently. No login, no trust in us required.

Audit trail

Who shared what, with whom, & when. Every send is logged for your tenant & exports to CSV in a click.

Reusable templates

Save the redaction rules & share patterns your team uses again & again, so controlled sharing stays one click.

Hash‑only storage

We keep a fingerprint of what you shared, never the email itself. Enough to prove authenticity, & nothing more.

BEC detection Coming

Flag business‑email‑compromise patterns before a forged thread spreads. On the roadmap & in design now.

What we store

A fingerprint, not your email.

  • Your message content never lands in our database. We store a one‑way SHA‑256 hash: a fingerprint that can confirm a match but can't be reversed back into the email.
  • Sign‑in runs through your own Microsoft 365 tenant over Azure AD. Nootro acts on your behalf, never around you.
  • Recipients verify against the fingerprint alone. The verification page reveals authenticity, never the contents.
For recipients

Anyone can check. No account needed.

Every Nootro share carries a link to verify.nootro.ai. Recipients click it & get a plain answer: is this authentic, & was anything changed. No sign‑up, no software, no peek at content they shouldn't see.

Open the verifier

Ready to unlock your inbox?

Nootro is onboarding a small group of design partners on Microsoft 365. If controlled, verifiable email sharing is a problem you have, we'd like to hear from you.

Currently onboarding design partners · built for Outlook