What is Microsoft 364?

Microsoft 364 is a joke nickname for Microsoft 365 that spread during the November 12th, 2026 service outage, subtracting a day from the brand's name to mark the lost uptime.

Where did Microsoft 364 come from?

The tag surfaced on X and TikTok on November 12th, 2026, after Outlook, Teams and Copilot went down for users across dozens of countries. Early posts like @MikeBeauvais's 'circle back in January' helped cement the format.

What does Microsoft 364 mean?

The pun calls out the gap between Microsoft 365's year-round branding and the outage that cost users roughly a full day of service. Some posts took the gag further with 'Microsoft 363' for regions that lost two days.

How do you use Microsoft 364?

Common moves include editing the Microsoft 365 logo so the '5' becomes a '4,' posting mock out-of-office replies telling colleagues to 'circle back in January,' or filming TikToks that celebrate the downtime as a surprise holiday.

Is Microsoft 364 still popular?

As of mid-November 2026, the joke was trending, with individual TikToks about the outage reaching several million views each within a day and major outlets like Mashable covering the meme wave.

Microsoft 364

2026catchphrasetrending

Published November 14, 2026

Microsoft 364, sometimes written as Microsoft 363, is a joke nickname that took hold after Microsoft 365 suffered a widespread outage starting November 12th, 2026, knocking out Outlook, Teams and Copilot for roughly a day. Office workers mocked the '365' branding by subtracting a day or two from the year and begging engineers to take their time with the fix. By Friday the 13th, TikTok videos riffing on the gag had collected millions of views across accounts like @caro.sidequest and @alfonsofoster_.

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Overview

Posts under the Microsoft 364 banner typically fall into a few buckets. One batch alters the Microsoft 365 wordmark itself, with the '5' struck through and replaced by a '4' or '3' to mark the days lost to the outage1. Another batch is text based, with workers posting mock out-of-office replies and messages telling colleagues there's no point returning until January3. Video creators cast the downtime as an unofficial holiday, staging coffee breaks, naps and refusals to clock back in2.

TikTok

The tone across the format sits closer to relief than anger. Instead of demanding faster fixes, posters openly thank Microsoft for the accidental time off and ask engineers to 'take their time' with Exchange Online2. The pun also doubles as a jab at the brand promise, since '365' implies year-round uptime and a single lost day is enough to rename the product1.

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Origin & Background

Platform

X / TikTok (viral spread)

Date

2026

Microsoft 365, the productivity suite covering Outlook, Teams, SharePoint and Copilot, went down for users in dozens of countries starting the afternoon of November 12th, 2026, with Exchange Online recovery attempts failing and extending the disruption into Friday the 13th2. The outage hit hundreds of thousands of accounts across Asia, Europe and the Middle East in particular, where it landed during active business hours2.

The nickname surfaced the same day on X, where users riffed on the '365' number by subtracting the days lost. On November 12th, @MikeBeauvais posted 'Let's circle back then / no point coming back until January,' a joke about an outage-induced vacation that collected more than 1.7 million views and 147,021 likes within about 21 hours4. Economic Times credited those posts, along with edited logos swapping the '5' for a '4,' as the seeds of the 'Microsoft 364' tag1.

How It Spread

X picked up the joke fastest. Developer @geerlingguy's post about the outage drew more than 2.9 million views and 81,928 likes in roughly a day5, while @MikeBeauvais's 'circle back in January' line stayed near the top of corporate timelines through the 13th4. Screenshots of frozen Teams clients and Outlook error pages anchored thousands of reply threads under the Microsoft 364 tag3.

TikTok ran even harder with it. On November 12th, @caro.sidequest posted a video about the outage that collected over 3.3 million views and 495,400 likes in about 22 hours6. The same day, @whitleylawfirm's clip reached 2.2 million views and 340,300 likes in 21 hours7, while @alfonsofoster_'s video drew 4.4 million views and 606,900 likes across 22 hours8.

Mashable covered the trend under a Friday the 13th angle, reporting that the outage's timing right before the weekend in Asia, Europe and the Middle East turned a corporate IT problem into what it called a 'viral meme festival'2. Economic Times followed with an explainer tying the Microsoft 364 pun to workers begging engineers not to fix Outlook too quickly1.

Timeline

2026-11-12

Microsoft 365 outage begins in the afternoon, taking down Outlook, Teams, SharePoint and Copilot for users across dozens of countries.

2026-11-12

X user @MikeBeauvais posts 'Let's circle back then / no point coming back until January,' which collects 1.7 million views in about 21 hours.

2026-11-12

TikTokers @caro.sidequest, @whitleylawfirm and @alfonsofoster_ post outage videos that each top 2 million views within a day.

2026-11-13

Outage drags into Friday the 13th after Exchange Online recovery attempts fail; Mashable documents the 'Microsoft 364' meme wave.

2026-11-13

Economic Times publishes an explainer on the nickname and the workers 'begging Microsoft not to fix Outlook' angle.