Microsoft 365

Email security for Microsoft 365 that reads intent

Defender and EOP match what has been seen before. AI-written attacks are written once and never reused. StrongestLayer connects by API in 15 minutes, with no MX changes and no mail rerouting.

15-min setup · no MX changes · free POC
Trusted by Orrick · Teays Valley Schools · law firms · K–12 · SaaS
$51.97 ROI per $1 spent
SOC 2Runs alongside DefenderNo MX changesVerdicts inside Outlook

Built for the Microsoft 365 stack

A reasoning layer on top of what you already run, not a replacement for it.

Connects by API, not MX

No mail rerouting, no connector surgery, no change to your routing topology. Grant API access and you are protected in about fifteen minutes.

Runs alongside Defender

Not a rip and replace of EOP or Defender for Office 365. Everything you have keeps running; we reason about what it lets through.

Verdicts inside Outlook

Inbox Advisor puts an explainable verdict in the message your user is already reading, in the client they already use. No new console to learn.

Nothing to roll back

Because mail flow never changes, removing it is as quick as adding it. No MX cutover, no downtime window, no change freeze to negotiate.

Inbox Advisor saves my department hours every week by cutting down triage time on every alert, while the SOC dashboard shows exactly what my team needs at a glance. StrongestLayer is that rare tool that is both incredibly powerful and genuinely well-designed.
Thomas Wimbish · Director of Technology, Teays Valley Local Schools
90%
reduction in triage time, cases close in minutes

See what Microsoft 365 approved.

15 minutes with our team, times shown in your local zone, invite sent instantly.

Book a 15-min demo →
See what Microsoft 365 approved15-min demo · no MX changes
Book a 15-min demo
mail.company.com · alex@company.com
Mail
Inbox 24
Flagged
Sent
Archive
Inbox Advisor
StrongestLayer add-in active.
Suspicious? Ask the Advisor.
StrongestLayer
SECURITY OPERATIONS
Home
Threat Landscape
Message Log Early Access
STOPPED PRE-DELIVERY
2,000
CONFIRMED THREATS
THIS MONTH
Inbox
Your mailbox, with the StrongestLayer Inbox Advisor add-in.
AP
Acme Procurement now
Q3 invoice #4417: payment confirmation…
SW
Sarah Whitman 9:14
Re: MSA redlines, final pass attached
GH
GitHub 8:52
[app/core] PR #2291 merged
ST
Stripe 8:31
Your February invoice is available
Q3 invoice #4417: payment confirmation
AP
Acme Procurementinvoices@acmelogistics.com · to alex@company.com

Hi Alex,

Payment for Q3 invoice #4417 cleared on our side this morning — thank you for the quick turnaround.

A stamped copy is attached for your records. No changes to our remittance details; everything stays as it has for the last three years.

Best,
Dana Reeves · Accounts Receivable, Acme Logistics

invoice-4417-stamped.pdf · 182 KB
Reply Reply All Forward
Inbox Advisor
RIGHT IN YOUR MAILBOX
reading intent…
Sender verified: 3-year relationship, 142 prior threads
Stated purpose matches request: routine invoice
No credential requests, no payment redirects
SAFE TO TRUST 0TRUST SCORE
Legitimate vendor invoice. Safe to engage with links and attachment.
Threat Triage
Emails StrongestLayer stopped, each with an explainable verdict.
billing@acmelogisticss.com MALICIOUS
Updated banking details for Q3 invoice
no-reply@docusign-view.net MALICIOUS
Action required: document awaiting signature
ceo.office.mail@gmail.com MALICIOUS
Quick task - are you at your desk?
STOPPED PRE-DELIVERY · CASE #1382
Updated banking details for Q3 invoice
billing@acmelogisticss.com
BEC / FraudImpersonation: VendorFirst encounter
Verdict
EXPLAINABLE · PRE-INVESTIGATED
MALICIOUS HIGH SEVERITY
Stated purpose: routine invoice
Actual request: redirect payment
Domain is 1 letter off real vendor
Vendor has never used this bank
Hunt similar threats →
Threat Hunt
Turn one threat into an organization-wide sweep.
HUNT BY IOC
SWEEPING PROTECTED MAILBOXES 0 / 1,384
m.torres@…Finance
Updated banking details for Q3 invoice
● FOUND✕ QUARANTINED
j.okafor@…Accounts Payable
RE: Updated banking details for Q3 invoice
● FOUND✕ QUARANTINED
d.kim@…Procurement
Acme Logistics: new remittance information
● FOUND✕ QUARANTINED
+ 9 moreacross the org
Same sender infrastructure · same payload
● FOUND✕ QUARANTINED
MATCHES12
MAILBOXES8
REMEDIATED100%
TIME TO SWEEP1m 42s
Suspicious email? Ask the Advisor.