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<link> in Outlook 365

Not supported <link> is not supported in Outlook 365.

Works in 3 of 21 · not supported in 18

Which clients
Works
Outlook Classic, Apple Mail, Apple Mail iOS
Not supported
Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman

Your reader in Outlook 365 sees the email without <link>, even if it looks right where you tested it.

The fix for Outlook 365

Inline all CSS instead of using external stylesheets

after 
<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>
Show the original
before 
<head>
  <link rel="stylesheet" href="styles.css" />
</head>

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What Outlook 365 does with <link>

@emailens/engine 0.18.22 on the original code

Outlook 365 does not support external stylesheets.

Your next question

Every feature in Outlook 365 · <link> in every client

Questions

How many email clients support <link>?
It works in 3 of 21, not supported in 18.
What do I use instead of <link> in Outlook 365?
Inline all CSS instead of using external stylesheets.
Does <link> work in Outlook (New)?
<link> is not supported in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.

To see what else in your email Outlook 365 does not support, paste the whole email.

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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 21 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping