Microsoft has been transitioning users to a redesigned version of Outlook. Here's what's actually different between the two versions — and why some users are opting out of the choice entirely.
Design and performance
New Outlook uses a simplified, modern interface closely aligned with Outlook on the web, while classic Outlook retains the traditional desktop application feel and a broader set of established desktop features.
Feature differences: the short version
Classic Outlook still supports a broader range of legacy features that new Outlook hasn't fully replicated. The biggest gaps include offline support, PST functionality, advanced rules, some Quick Steps capabilities, COM add-ins and VBA macros, and certain delegation and customization features. Microsoft continues to add features to new Outlook, so the comparison is evolving.
Which should you use right now?
If you rely on COM add-ins, VBA macros, extensive PST workflows, or features that remain only partially available in new Outlook, classic Outlook may still be the better fit.
If you prefer a newer interface and don't depend on those legacy features, new Outlook is Microsoft's direction for the future.
A third option: sidestep the debate entirely
Rather than choosing between Microsoft's two Outlook clients, some users may prefer a different desktop email client altogether.
eM Client
eM Client offers full offline access, Quick Actions, powerful rules, Snooze, Watch for Replies, advanced search, attachment search, encryption, and an integrated all-in-one app for email, calendar, tasks, contacts, notes, and chat.
eM Client 11 builds on that with a major AI tools upgrade, including an AI Assistant, personalized AI writing, conversation summaries, natural-language search, AI-generated rules, Quick Replies, and built-in MCP support, allowing AI assistants to connect to the mailbox and perform actions.
It also adds eM Sync for syncing accounts and settings across devices.
FAQ
Can I switch back and forth between classic and new Outlook?
Yes, using the in-app toggle, and Microsoft currently supports using classic and new Outlook side by side during the transition.
Will new Outlook eventually replace classic Outlook completely?
Microsoft's stated direction is toward new Outlook as the long-term default, though exact timelines have shifted — check Microsoft's official roadmap for current status.
Does new Outlook support offline work yet?
Partially. New Outlook supports offline access, but it still doesn't match classic Outlook's local-cache experience. If full offline functionality is important, eM Client offers a dedicated offline mode, with synchronized emails, calendars, contacts, and queued outgoing messages available without an internet connection.
Is there an option that isn't caught in this transition?
Yes — eM Client offers a stable, complete feature set on the same account without being tied to Microsoft's rollout schedule.
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