One is a generic AI built into the M365 suite. The other is trained on your business and drafts in your voice. Here is the honest comparison for Outlook professionals.
If you are weighing SMART Reply against Microsoft 365 Copilot, you are choosing between two very different ideas of what an AI email assistant should be. Copilot is Microsoft's general purpose AI, woven through Word, Excel, PowerPoint, Teams and Outlook. It is genuinely impressive at cross app work like turning a meeting into a deck, summarising a long thread, or asking a question across your files.
SMART Reply is built for one job: every reply you send, every comment you write on LinkedIn, every follow up after a meeting should sound like you and represent your business properly. It learns from your past emails, your website, your documents and your customers. Copilot does not. Copilot drafts in a generic professional voice that gets the grammar right but rarely sounds like you.
The choice depends on what you actually need. If you want one assistant for the whole M365 suite, Copilot is the broader fit. If you want every external communication to sound like you, SMART Reply is the focused tool.
Enterprise buyers are no longer asking "does the AI work". They are asking "does it leak our data, ignore our policies, or trigger a regulator". Here are the four risks coming up most often, and how SMART Reply is built to handle each one.
Microsoft Copilot inherits the full Microsoft Graph permissions of the user. Real incidents have been reported where Copilot surfaced payroll, HR or strategy documents that the user had a stale or over broad SharePoint share to and should not have seen surfaced inside an email reply suggestion.
Most consumer AI tools (and even some enterprise ones, by default) use whatever you paste into them as training data. The viral LinkedIn post making the rounds right now is correct on the principle: assume anything you put into a public AI engine can resurface, in some form, somewhere else. For client documents, internal strategy and creative work, that is a real exposure.
The next generation of AI tooling (agentic AI) takes actions for you. Documented incidents include AI agents deleting production databases, sending emails outside the company without review, and moving files in ways that bypassed the human approval steps the security team relied on. For regulated firms, that is a control gap.
AI tools that process data across multiple jurisdictions, retain inputs for training, or take autonomous actions are now under regulator scrutiny under GDPR, the EU AI Act, the UK Data Protection Act, and sector regimes like FCA and HIPAA. Many compliance frameworks written for SaaS do not cleanly cover AI workflows. The audit trail and data residency questions get hard, fast.
Pricing accurate as of May 2026. Microsoft Copilot requires an existing Microsoft 365 business licence.
SMART Reply Signal turns important meetings and emails into tracked follow through. It captures actions, drafts replies, detects responses, updates action status, finds related emails and keeps the conversation moving until everything is complete.
Signal decides what should happen next. SMART Reply writes the actual email using the normal drafting pipeline.
SMART Reply runs entirely inside your Microsoft 365 tenant. Your content is not used to train any model. It cannot read across SharePoint permission boundaries, which is the route Copilot has been documented exposing internal data through. And nothing sends, files, or moves without your explicit click. For regulated industries and EU AI Act compliance, that posture is the difference.
SMART Reply works inside Outlook and inside LinkedIn, with branded booking pages, travel planning and diary blocks, brand identity controls and one click filing. Copilot is Microsoft only. For roles where the conversation spans email, LinkedIn and external partners, that scope matters.
SMART Reply Signal turns important meetings and emails into tracked workflows. It captures actions, drafts replies, detects responses, reconciles completion and recommends the next step. Copilot can summarise a meeting but does not track follow through across the conversation that follows. For enterprise teams, this is the differentiator.
SMART Reply learns from your past emails, your website, your documents and your customers, then drafts in your voice. Microsoft Copilot drafts in a generic professional voice and only sees your Microsoft Graph data. For replies that sound like you, SMART Reply is the more focused tool. For cross app productivity across Word, Excel and Teams, Copilot is the broader fit.
No. Copilot is built into the Microsoft 365 suite. SMART Reply ships a Chrome extension that adds an AI draft button to LinkedIn comments and direct messages, so you can reply on LinkedIn without leaving the page.
Microsoft 365 Copilot is around £25 per user per month, plus the cost of your M365 license. SMART Reply is £35 per user per month with no separate license required. SMART Reply also includes meeting follow through, branded booking pages, travel planning and OneDrive filing in the same price.
Yes. They run in parallel. Many SMART Reply customers keep Copilot for Word, Excel and Teams summaries, and use SMART Reply for any communication that has to sound like them. They do not interfere with each other.
Copilot is generic. It will draft a perfectly competent reply that sounds like every other Copilot reply. SMART Reply is trained on your specific business and learns your tone from every edit, so the reply sounds like something you would have written. For sales, account management, client services and founder communication, that distinction is the difference between a draft you send and a draft you rewrite.
No. SMART Reply only reads what your individual user account already has access to inside Outlook. It does not crawl SharePoint, OneDrive or Teams across the organisation. Copilot for Microsoft 365 inherits the broader Microsoft Graph permissions of your account, which has caused documented oversharing incidents where Copilot surfaced payroll, HR or strategy documents that the user technically had a stale share to but should not have seen surfaced in a reply suggestion.
Yes. Your email content stays inside your Microsoft 365 tenant, your data is not used to train any model, and every action requires an explicit human click. Those three properties cover the most common GDPR concerns (data residency, lawful basis for processing) and the EU AI Act risk classifications around autonomous decision making. Full details are in the privacy policy.
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