New Outlook for Windows and classic Outlook share many everyday calendar and contact features, but they are not interchangeable for every workflow. Microsoft’s feature matrix, last updated September 23, 2026, shows new Outlook has some calendar capabilities classic Outlook lacks, while classic retains features that are upcoming, partially available, under investigation, or unsupported in new Outlook. Compare the specific tasks you rely on before switching.
How to read Microsoft’s feature comparison
Microsoft labels features as “Available,” “Partially available,” “Not supported,” “Under investigation,” “Upcoming,” or “Revised.” “Partially available” means some existing functionality may be missing; “Revised” means the feature uses a different approach, not necessarily that it works identically. The matrix is a snapshot, not a guarantee of behavior for every account or organization. Microsoft says not all capabilities are listed and points readers to its monthly “What’s new” updates. See Microsoft’s feature comparison.
Calendar: where the clients overlap
Microsoft marks the Calendar module as available in both clients. It also lists the following as available in both:
- 3-day calendar view and keyboard navigation
- Optional attendees, category colors, delegate access, and group calendars
- Quick event creation and saving a meeting as a draft
- Sending updates only to attendees who were added or removed
- Applying sensitivity labels to events
- Automatically declining invitations when an attendee’s calendar is busy
- Keeping an email in the inbox after responding to an invitation
- Shortened meetings and showing “working elsewhere”
- Calendar offline support, with an important qualification explained below
Calendar: workflow differences that can affect a switch
| Calendar task | New Outlook | Classic Outlook |
|---|---|---|
| Edit “this and all following” events in a series | Available | Not supported |
| In-person events | Available | Not supported |
| Following meetings | Available | Not supported |
| Meeting recap | Available | Not supported |
| Preserve declined meetings | Available | Not supported |
| Set work hours and location | Available | Not supported |
| Calendar conditional formatting | Upcoming | Available |
| Schedule View | Upcoming; status updated April 2026 | Available |
| Cut calendar events | Upcoming | Available |
| Multi-select events | Upcoming | Available |
| Custom holidays files (.hol) | Under investigation | Available |
| Calendar .ics support | Partially available: preview is available when an invitation is dragged and dropped onto the calendar; further enhancements are upcoming | Available |
| SharePoint calendar sync | Not supported; Microsoft points to group calendars as an alternative | Available |
These entries make a task-based check more useful than a general claim that one client has “more” calendar features. For example, a user who depends on Schedule View or SharePoint calendar sync should not treat the existence of a Calendar module as proof that the same workflow is ready in new Outlook.
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Do not conflate calendar offline support with full offline support
The matrix marks the calendar-specific offline-support row as available in both clients. Its separate broad Offline support row is only “Partially available” for new Outlook, with a status update in August 2026. If you need a calendar while disconnected, verify the exact offline workflow you use rather than assuming that calendar support means every part of Outlook works offline.
Contacts and People: core tasks versus changed features
Microsoft marks Contacts/People, contact lists, favorite contacts, preview contacts, offline support, and the Global Address List as available in both clients. Basic contact actions—adding, finding, editing, and deleting contacts—are also listed for both. That does not establish identical behavior for every organization’s directory, delegated setup, or account-specific contact source.
| Contacts or People feature | New Outlook | Classic Outlook |
|---|---|---|
| Address book | Revised; status updated April 2026 | Available |
| Contact categories | Revised | Not supported |
| Distribution-groups management | Revised; status updated December 2025 | Available |
| Sharing a Contacts folder | Under investigation | Available |
| Business cards | Not supported | Available |
Because “Revised” indicates a different implementation, validate address-book, contact-category, or distribution-group steps that matter to you instead of assuming the familiar workflow carries over unchanged. Contact-folder sharing and business cards are clearer decision points: the matrix does not list folder sharing as available in new Outlook, and it marks business cards unsupported there.
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What to check before moving from classic Outlook
- List your must-have workflows. Include recurring-series edits, Schedule View, conditional formatting, .ics invitations, SharePoint calendar sync, contact-folder sharing, business cards, and any address-book or distribution-group procedures.
- Check each item in Microsoft’s matrix. Treat “Upcoming” and “Under investigation” as not currently equivalent to “Available”; treat “Partially available” and “Revised” as reasons to test the precise task.
- Test with the account and organization you actually use. A matrix label does not establish that every tenant, directory, delegate arrangement, or contact source behaves the same way.
- Confirm subscription eligibility for any feature that requires it. Microsoft notes that some features require a qualifying Microsoft 365 work or school subscription, but the matrix does not map that condition to every calendar and contact item.
- Recheck the matrix before a migration. Microsoft labels this matrix last updated September 23, 2026, and roadmap statuses can change.
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