Outlook’s Scheduling Assistant is the built-in way to compare calendars side by side and find a time when everyone is actually free — without the email chain. It pulls free/busy data straight from Exchange Online, so anyone inside your Microsoft 365 tenant shows up with colored blocks for busy, tentative, and out-of-office time. Attendees outside your org only show availability if their tenant shares free/busy with yours.

Here’s how to use it in every version of Outlook in 2026.

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1. New Outlook Desktop & Outlook on the Web

The new Outlook for Windows and Outlook on the web (outlook.office.com) share the same codebase, so the Scheduling Assistant works identically in both.

Open the Scheduling Assistant

1. Click New event in the calendar (or New > Meeting from mail).
2. In the event window, click the Scheduling Assistant tab at the top — or, if you’re in the compact view, click Scheduling Assistant in the toolbar.

You’ll see a time grid with your own calendar at the top and empty rows below for attendees.

Add attendees

1. In the Attendees column on the left, start typing a name, email, or distribution list. Suggestions appear from your org’s directory.
2. Click the person icon next to each name to toggle Required vs Optional.
3. To add a conference room or equipment, type the room’s name or click Add a location and pick a resource. Resource calendars auto-accept or decline based on availability.

As soon as each attendee resolves, their free/busy row populates.

Find a time and book it

• Drag the green (start) and red (end) handles on the meeting bar to any open vertical strip.
• Or open the Suggested times panel on the right sidebar — new Outlook ranks the top open slots where all required attendees are free.
• Switch back to the main event view to confirm the title, body, Teams link toggle, and categories, then click Send.

Tip: The new Outlook respects working hours. Slots outside an attendee’s published working hours show a lighter tint even when the calendar is technically free.

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2. Classic Outlook for Windows

Classic Outlook for Windows still has the most feature-rich Scheduling Assistant. If you rely on AutoPick constraints or complex Room Finder filters, this is the version to use.

Open the Scheduling Assistant

1. On the Home tab, click New Meeting (or press Ctrl+Shift+Q).
2. In the meeting window, click the Scheduling Assistant button on the Meeting ribbon.

The window splits into an attendee list on the left and a time grid on the right, with the Room Finder pane on the far right.

Add required, optional, and resource attendees

1. Click the Add Attendees button (or type directly into the All Attendees column).
2. In the Select Attendees and Resources dialog, pick each person and click Required, Optional, or Resources.
3. Click OK to return to the grid.

You can also click the icon next to any name in the All Attendees column to change their role after the fact.

Use AutoPick Next

1. Click the AutoPick dropdown above the grid.
2. Choose a constraint:
   • All People and Resources — everyone and any room must be free.
   • All People and One Resource — everyone plus at least one available room.
   • Required People — only required attendees must be free.
   • Required People and One Resource — required attendees plus a room.
3. Click AutoPick Next (the >> button). The meeting bar jumps to the next available slot that matches your constraint. Click it again to skip forward.

Use Room Finder

1. If the Room Finder pane isn’t visible, click Room Finder on the Meeting ribbon.
2. Pick a Building from the dropdown (this pulls from your tenant’s room list).
3. Filter by Capacity, Floor, or features like AudioVisual.
4. Suggested rooms appear in the list — click one to add it to the meeting.
5. The Suggested times section below the mini calendar highlights slots with the fewest conflicts in green, yellow for some conflicts, and red when most attendees are busy.

Finish and send

Switch back to the Appointment tab to set the subject, body, and reminder, then click Send.

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3. Outlook for Mac

Outlook for Mac has a streamlined Scheduling Assistant — most of the grid features are there, but AutoPick is labeled differently and Room Finder is simpler.

Open the Scheduling tab

1. In the calendar, click New Event (or press Cmd+N in the calendar view).
2. Add attendees in the Invitees field at the top.
3. Click the Scheduling tab at the top of the event window.

Work the grid

1. Each attendee appears as a row. Click the icon to the left of a name to mark them Required or Optional.
2. Drag the meeting bar (the shaded column) to an open slot.
3. Click AutoPick at the bottom of the window and choose Next Available Time to jump to the next slot where all required attendees are free. Use Previous Available Time to walk backward.

Add a room

1. In the Location field, type the room’s name or click the Room Finder icon.
2. Pick a Room List (building), then select an available room. The room’s free/busy row appears in the grid.

Switch back to the Event tab to set the body and categories, then click Send.

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Reading the Free/Busy Grid

Every Outlook version uses the same color legend, which appears at the bottom of the Scheduling Assistant:

Color / Pattern	Meaning
Solid blue	Busy
Striped blue	Tentative
Solid purple	Out of Office
Striped gray / diagonal lines	No Information
Lighter tint / shaded column	Outside working hours
Pink or red outline	Conflict with the current meeting bar

No Information usually means one of three things:

1. The attendee is in a different Microsoft 365 tenant that doesn’t share free/busy with yours (most common for external clients and vendors).
2. The attendee has their calendar permissions locked down so your account can’t see availability.
3. Their mailbox is on-premises or on a different calendar platform (Google, iCloud) that doesn’t federate with your Exchange Online tenant.

Inside a single Microsoft 365 tenant, everyone sees everyone else’s free/busy by default. The grid is only useful when you and your attendees share a calendar backend — which is why cross-company meetings almost always need a scheduling link or poll instead.

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Use AutoPick and Room Finder

AutoPick is the fastest way to find a slot when you have more than three or four attendees. The core behavior:

• AutoPick always jumps to the next (or previous) open slot matching your constraint — it does not rank or filter.
• Constraints are strict: if you pick All People and One Resource, AutoPick will skip any slot where a single required attendee is busy, even if everyone else is free.
• If AutoPick can’t find a slot in the next few weeks, it silently does nothing. Relax the constraint (switch to Required People) or move the date range forward manually.

Room Finder is the room-specific version:

• It only works with room lists configured by your Microsoft 365 admin (a list of rooms grouped by building).
• Filters include capacity, floor, and room features (camera, whiteboard, etc.) when admins tag rooms.
• Suggested times inside Room Finder combine attendee availability with room availability — green is best, yellow is partial conflicts, red is mostly busy.

In the new Outlook, Room Finder and AutoPick are consolidated into the Suggested times panel. In classic Outlook, they’re separate tools on the ribbon.

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Propose a New Time as an Attendee

If you’ve received a meeting invite that conflicts with something on your calendar, you don’t have to decline — you can counter-propose.

New Outlook / Web

1. Open the invite in your inbox or calendar.
2. Click Propose new time in the invite header. Choose Tentative and Propose or Decline and Propose.
3. The Scheduling Assistant opens with everyone’s availability pre-loaded. Drag the meeting bar to a new slot.
4. Click Send. The organizer gets an email with your proposed time and can accept (which reschedules the meeting for everyone) or decline.

Classic Outlook for Windows

1. Open the invite or right-click it in the inbox.
2. Choose Propose New Time > Tentative and Propose New Time or Decline and Propose New Time.
3. Use the grid to pick a slot, then click Propose Time.

Outlook for Mac

1. Open the invite.
2. Click Propose New Time in the toolbar.
3. Pick a new time and click Send Proposal.

Note: Propose New Time is disabled if the organizer turned off counter-proposals when creating the meeting, or for meetings sent from certain third-party calendar systems.

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Troubleshooting: Why Can’t I See Someone’s Availability?

If an attendee’s row shows all diagonal stripes, walk through this list:

1. Different tenant. External attendees from other Microsoft 365 tenants don’t share free/busy by default. Your admin would need to configure an organization relationship with their tenant to enable cross-tenant free/busy.
2. Non-Exchange calendar. Google Workspace, iCloud, and on-prem Exchange servers don’t publish free/busy to Exchange Online. You’ll see No Information even if the person responds from Outlook.
3. Permissions too restrictive. The attendee may have set their default calendar permission to None instead of Free/Busy time. They can change this in Calendar Properties > Permissions > Default.
4. Wrong address. Outlook resolved the name to the right person, but their free/busy is published under a different mailbox (common after migrations). Ask them to check File > Account Settings for their primary SMTP address.
5. Delegate/shared mailbox. Free/busy lookups sometimes fail for shared mailboxes. Add the actual human delegate as the attendee instead of the shared mailbox.
6. Out-of-date Autodiscover. If free/busy just broke, restart Outlook and run Test E-mail AutoConfiguration (Ctrl+right-click the system tray icon). Stale Autodiscover records are a frequent cause.

If none of those apply, the fastest workaround is to send a scheduling poll or a link to your availability instead — you don’t need their free/busy if they pick the time themselves.

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Quick Reference

Feature	New Outlook	Outlook on the Web	Classic Outlook (Windows)	Outlook for Mac
Scheduling Assistant tab	Yes	Yes	Yes	Yes (Scheduling tab)
Required / Optional toggle	Yes	Yes	Yes	Yes
AutoPick Next	Suggested times panel	Suggested times panel	Yes (with constraints)	Yes (Next/Previous)
Room Finder	Yes (Suggested times)	Yes (Suggested times)	Yes (full filters)	Yes (basic)
Propose New Time	Yes	Yes	Yes	Yes
Cross-tenant free/busy	Depends on admin	Depends on admin	Depends on admin	Depends on admin
Working-hours shading	Yes	Yes	Yes	Yes

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Which Method Should You Use?

• Internal meeting with 2–4 people? Any version’s Scheduling Assistant is fine. Drag the bar to an open slot and send.
• Internal meeting with 5+ people or a required room? Use classic Outlook for Windows — AutoPick constraints plus Room Finder filters save real time.
• On a Mac? The Scheduling tab covers 90% of cases. For complex room filtering, open Outlook on the web in a browser.
• Meeting with anyone outside your tenant? Don’t rely on the grid. Send a scheduling link or a poll — No Information rows make the assistant nearly useless for external attendees.
• Already on someone’s calendar and want to move it? Use Propose New Time rather than declining and starting over.

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Skip the Back-and-Forth Entirely

The Scheduling Assistant works well inside a single Microsoft 365 tenant, but it falls apart the moment you need to schedule with clients, vendors, or anyone on a different calendar system. Carly is an AI assistant that schedules meetings across calendars automatically — it reads free/busy from Outlook, Google, and iCloud, drafts invites, and handles the reschedules when something changes. Carly connects to 200+ apps, so the meeting-related follow-ups (CRM notes, Slack pings, task creation) happen without a second prompt.

More on Outlook: How to send calendar availability in Outlook · How to create a meeting poll in Outlook · How to create a poll in Outlook · How to set up recurring meetings in Outlook · How to create a calendar event in Outlook · How to share your Outlook calendar · How to delegate calendar access in Outlook · How to set working hours in Outlook Calendar · How to add time zones in Outlook Calendar

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