New Outlook for Windows and classic Outlook for Windows share many everyday email and calendar features, but they are not interchangeable. The biggest practical gaps are COM add-ins and VBA macros, offline work, PST workflows, multiple profiles, and some account configurations. New Outlook also has selected features classic Outlook lacks, so the right choice depends on the workflows you rely on—not which interface looks newer.
What’s the difference between new Outlook and classic Outlook?
Microsoft’s feature comparison, last updated September 23, 2026, shows substantial overlap in core mail and calendar functions, but not full feature parity. Microsoft says its matrix is not exhaustive, and some capabilities depend on a qualifying Microsoft 365 subscription. The comparison uses “partially available” for features that exist but may not include all the functionality found in classic Outlook. See Microsoft’s current feature comparison.
| Area | What to expect in new Outlook | What it means for classic Outlook users |
|---|---|---|
| Everyday mail and calendar | Many shared features, including Focused Inbox, categories, message recall, reactions, link previews, and common calendar actions. | Core tasks may carry over, but check the exact feature and workflow rather than assuming identical behavior. |
| Legacy extensibility | COM add-ins, VBA macros, the Outlook Object Model, and MAPI are listed as unsupported. | Processes that depend on those tools need a verified alternative before switching. |
| Offline access and PST files | Both are marked partially available in Microsoft’s comparison. | Some workflows are supported, but the client is not feature-equivalent to classic Outlook in these areas. |
| Newer or different capabilities | Category favorites and pinning, meeting recap, and preserving declined meetings are listed as available in new Outlook but not classic. | Some users may gain features as well as lose or change workflows. |
Microsoft also lists conditional formatting, delay send, mail merge, Quick Steps, and some template and PST functionality as partial or not fully aligned. There is no evidence in the comparison of a single overall winner; the outcome depends on which features matter to you.
Does new Outlook support your email account?
Microsoft lists Microsoft work or school accounts, Microsoft accounts such as Outlook.com and Hotmail, Gmail, iCloud, Yahoo, IMAP, and POP among the supported account types. Account support does not guarantee that every Outlook feature works identically with every provider.
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Can you use COM add-ins or VBA macros?
No. Microsoft’s comparison lists COM add-ins and VBA macros as unsupported in new Outlook; it also marks the Outlook Object Model and MAPI unsupported. This matters if an add-in or macro automates a business process, changes messages, or connects Outlook to another application.
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Some COM add-ins have web-add-in counterparts, but that is not a universal conversion. Microsoft’s setup guidance identifies counterparts for a defined set of products, including Adobe Acrobat, Cisco Webex Meetings, Evernote, HubSpot, Jira Cloud, RingCentral, and Zoom. Availability and behavior can differ, and web add-ins have limitations with third-party accounts.
Microsoft says some settings and listed web-add-in counterparts may be imported or installed when you start new Outlook. Settings import requires that the cloud-settings option was selected in classic Outlook, and an administrator can block add-in installation. Check the exact add-in, permissions, settings, and administrator policy before depending on a replacement. Add-ins may also have their own privacy policies, terms, and permissions. Microsoft’s setup guidance for importing settings and installing add-ins explains the conditions.
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Does new Outlook work offline?
Yes, if offline access is enabled—but Microsoft marks it as partial compared with classic Outlook. Microsoft says new Outlook can save a copy of email, calendar events, and people on the device for offline access. It also describes this as improving performance when online; that is a product description, not a comparative speed benchmark.
Before relying on offline access, check that it is enabled and verify that the messages, calendar information, and contacts you need are available without a connection. The feature’s presence does not establish that every offline action or data set behaves as it does in classic Outlook. Microsoft’s instructions for working offline in new Outlook describe the setting and local data.
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Can new Outlook open PST files?
Yes, but PST support is partial, not absent and not full classic Outlook parity. Microsoft’s comparison describes support for importing mail, calendar events, contacts, and tasks, alongside broader export and file-management capabilities, while noting that some classic Outlook capabilities remain unavailable.
Microsoft’s update log documents managing email inside PST files—including moving, copying, deleting, flagging, marking messages read or unread, and categorizing—plus folder operations and moving mail between a PST and a mailbox. These additions do not establish that every PST workflow in classic Outlook is supported. Microsoft notes that the documented PST capabilities are not available in Outlook on the web. Microsoft’s new Outlook update log records the relevant changes.
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Which features are shared, and which are different?
The comparison lists many familiar capabilities in both clients, including categories, Focused Inbox, message recall, and common calendar actions. It also identifies features where new Outlook has an advantage: category favorites and pinning, meeting recap, and preserving declined meetings are listed as available in new Outlook but unsupported in classic Outlook.
Other items are marked partial rather than fully aligned, including conditional formatting, delay send, mail merge, Quick Steps, offline access, and some template and PST functions. Some features may require a qualifying Microsoft 365 subscription, so check the matrix for the feature and account context you actually use. Microsoft says the matrix is not exhaustive and that its roadmap can change; its comparison page states, “We are actively listening to your feedback and will make updates and changes to our feature roadmap based on what you tell us.”
How to evaluate new Outlook without risking your workflow
- List dependencies. Identify your account type, add-ins, VBA macros, PST files, offline needs, delegated access, and any process that depends on Outlook automation.
- Check Microsoft’s feature matrix. Look up each required workflow in the current comparison, paying attention to “partial,” “upcoming,” and subscription-dependent entries.
- Test the actual setup. Try new Outlook with the account, data, and add-ins you use. Confirm that important actions work, including offline tasks and PST operations if those matter to you.
- Keep a fallback during the evaluation. Microsoft says new and classic Outlook can run side by side, and users can switch back to classic Outlook if a needed workflow is unavailable. Microsoft’s guidance on switching between Outlook clients covers the transition.
For organizations planning a broader deployment, Microsoft’s transition guidance for Windows Mail, Calendar, and People points users toward new Outlook or Outlook.com. Deployment stages and administrator guidance can change, so organizations should consult the current transition information before making rollout commitments. Read Microsoft’s transition guidance.
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