How to Sort Emails in Outlook (Every Version, 2026)
Sorting in Outlook reorders the messages already in a folder so you can find what you need fast — newest first, grouped by sender, biggest at the top, or unread before read. It’s different from filtering (which hides messages) and searching (which queries them). Anyone drowning in a busy inbox uses sorting to bring structure back.
This guide covers every current version: Outlook on the web, the new Outlook for Windows and Mac, and classic Outlook for Windows.
1. Sort by Date (Newest or Oldest First)
Date is the default sort in every version of Outlook. Here’s how to confirm it or flip the direction.
Outlook on the web / New Outlook (Windows & Mac):
- Open the folder you want to sort (e.g., Inbox)
- Click the Filter control at the top right of the message list (it may read All or show a sort/filter icon)
- Choose Sort by → Date
- Pick Newest on top or Oldest on top
Classic Outlook for Windows:
- Go to the View tab in the ribbon
- Click Arrange By → Date
- To reverse the order, click the Arrange By column header above the message list, or use View → Reverse Sort
You can also click the small sort indicator above your messages (it usually reads By Date with an arrow) and toggle Newest ↔ Oldest.
2. Sort by Sender (From)
Grouping by sender lines up every message from the same person, which is ideal for cleaning out one noisy contact or finding an old thread.
Outlook on the web / New Outlook:
- Click the sort control above the message list
- Choose Sort by → From
- Messages reorder alphabetically by sender name; click again to reverse A→Z ↔ Z→A
Classic Outlook for Windows:
- Go to View → Arrange By → From
- Or right-click the column header bar and choose From as the sort field
- Click the From header to toggle ascending/descending
3. Sort by Size
Sorting by size surfaces the biggest messages so you can delete or archive them and free up mailbox space — see how to find large emails in Outlook for a deeper cleanup walkthrough.
Outlook on the web / New Outlook:
- Click the sort control above the message list
- Choose Sort by → Size
- The largest messages move to the top
Classic Outlook for Windows:
- Go to View → Arrange By → Size
- Outlook groups messages into bands (Huge, Large, Medium, Small, Tiny)
- Or add a Size column: right-click the column header → Field Chooser → drag Size into the header row, then click it to sort
4. Sort by Subject
Sorting by subject alphabetizes messages by their subject line, which groups reply chains and same-topic threads together.
Outlook on the web / New Outlook:
- Click the sort control
- Choose Sort by → Subject
Classic Outlook for Windows:
- Go to View → Arrange By → Subject
- Or click the Subject column header in the message list to sort and reverse
Outlook ignores the Re: and Fwd: prefixes when sorting by subject, so replies sit alongside their originals.
5. Sort by Unread, Importance, or Flag
Beyond the basics, you can push unread or high-priority mail to the top.
Sort unread first (Outlook on the web / New Outlook):
- Click the sort control → Sort by
- There’s no direct “unread” sort field, but you can Filter → Unread to show only unread mail
- For a persistent unread-first view, the Focused Inbox and pinned messages handle prioritization instead
Sort by importance (classic Outlook for Windows):
- Go to View → Arrange By → Importance
- High-importance messages (red exclamation) move to the top, low-importance to the bottom
- To learn how messages get that priority, see how to mark an email as important in Outlook
Sort by flag / follow-up (classic Outlook):
- Go to View → Arrange By → Flag: Start Date or Flag: Due Date
- Flagged items group by their follow-up dates
6. Ascending vs. Descending
Every sort field can run in either direction:
- On the web / new Outlook: the sort menu offers paired options like Newest on top / Oldest on top or A on top / Z on top. Select the one you want.
- Classic Outlook: click any column header to sort by it; click the same header again to reverse the direction. The small triangle in the header points up for ascending and down for descending. You can also use View → Reverse Sort.
7. Save (Persist) a Sort
A sort isn’t a one-time action — Outlook remembers it per folder until you change it.
Outlook on the web / New Outlook: the sort order you choose sticks for that folder across sessions. It does not copy to other folders; set each folder’s sort independently.
Classic Outlook for Windows: to lock in a custom arrangement, go to View → View Settings → Sort, choose up to four sort fields and their direction, then click OK. To apply the same arrangement everywhere, use View → Change View → Apply Current View to Other Mail Folders.
Quick Reference
| Sort by | Web / New Outlook | Classic Outlook |
|---|---|---|
| Date | Sort control → Date | View → Arrange By → Date |
| Sender | Sort control → From | View → Arrange By → From |
| Size | Sort control → Size | View → Arrange By → Size |
| Subject | Sort control → Subject | View → Arrange By → Subject |
| Importance | (not available) | View → Arrange By → Importance |
| Reverse order | Pick paired option | Click column header again |
Troubleshooting
My inbox is grouped by conversation and I can’t sort by date properly.
Conversation view threads replies together, which overrides a clean date sort. On the web/new Outlook, click the sort control and turn off Show as conversations (or set Sort by → Date with conversations off). In classic Outlook, uncheck View → Show as Conversations.
I sorted by size but the Size column isn’t showing.
In classic Outlook, the Size column may be hidden. Right-click the column header bar, choose Field Chooser, and drag Size into the header. On the web, use the Sort by → Size menu rather than looking for a column.
My sort keeps resetting every time I reopen Outlook.
This usually means a corrupted view. In classic Outlook, go to View → Reset View, then reapply your sort. If it still resets, your Outlook profile or OST cache may need rebuilding.
Importance sort is missing on the web version.
Sorting by importance is only available in classic Outlook for Windows. On the web/new Outlook, filter by importance or set a rule that flags high-priority senders instead.
Sorting changed in one folder but not others.
Sort settings are per-folder by design. In classic Outlook, apply one folder’s view everywhere with View → Change View → Apply Current View to Other Mail Folders.
If you’d rather not reorder your inbox by hand every morning, Carly is an AI assistant that manages your inbox, handles scheduling, and connects to 200+ apps — triaging and surfacing the messages that actually need you first.
More on Outlook: How to filter emails in Outlook · How to clean up your inbox in Outlook · How to find large emails in Outlook · How to categorize emails in Outlook · How to flag emails in Outlook · How to create rules in Outlook
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
