AI writing assistant for Outlook — Windows and Mac

No. Rewrait works at the operating-system level on Windows and Mac, so there is no add-in to install: no AppSource listing, no admin consent in the Microsoft 365 admin center, no Exchange permissions, and nothing for IT to deploy or update. It behaves the same in new Outlook, classic Outlook, and Outlook on the web, because it acts on the text you select rather than plugging into the mail client. Select your draft, press Ctrl+Shift+P (Cmd+Shift+P on Mac), pick a style, and the rewrite replaces your selection in the compose pane. Since nothing connects to your mailbox, there is no mailbox access to security-review: Rewrait sees only the text you select, processes it on demand, and never trains on it. For most companies that makes the rollout conversation with IT considerably shorter.

Yes — Rewrait ships a native Windows app through the Microsoft Store alongside the Mac app, with the same features on both. That is rarer than it should be: Apple's Writing Tools are Mac-only by definition, the recent wave of hotkey rewriters is overwhelmingly Mac-first, and most other AI writing tools live in a browser extension that never reaches the Outlook desktop app at all. If your company runs a mixed fleet — account managers on Windows laptops, designers on MacBooks — Rewrait behaves identically on both sides: the same Ctrl/Cmd+Shift+P shortcut, the same styles, and on the Team plan the same shared workspace, so an email written in Outlook on Windows sounds like one written on a Mac. Windows users get first-class support here, not a port.

They solve different problems and coexist fine. Microsoft 365 Copilot is strongest inside Microsoft's own surfaces — summarizing long threads, drafting from meeting context — and is priced accordingly: $18–30 per user per month on top of a Microsoft 365 license. Rewrait does one job, rewriting the text you select in styles you saved, and does it everywhere: Outlook, but also Teams, Slack, Zendesk, your browser, and your CRM. Pro is $12 a month billed annually; Team is $20 a seat. If your company lives entirely in Microsoft products, Copilot may earn its price. If your stack is Outlook plus a heterogeneous everything-else, Rewrait covers the writing layer across all of it for less — and some teams run both, using Copilot to digest the mailbox and Rewrait to make every outgoing message sound like the team.

Everywhere you can select text. The same shortcut that rewrites an Outlook draft works in Teams chats, Word, your browser, Slack, Notepad, and any CRM or internal tool with a text field. That is the point of working at the OS level instead of shipping per-app plugins: one hotkey, one set of styles, no per-app setup, nothing that breaks when an app updates. Practically, that means the voice you use for client email carries into the Teams message that follows it, and the follow-up you type into the CRM matches both. A common pattern for email-heavy roles: Formal Email style for external mail, Native & Casual for internal chat, and Soften Tone for the reply you typed angry and shouldn't send as-is. Install once on Windows or Mac and the layer is simply there, in every app, whenever you select text.