Office 2021 support ends October 13, 2026: the 'October cliff' for the Office licenses of your Mexico operation

On September 15, the Spanish-language outlet Infobae reported that one version of Office 2021 “will stop working in a month”. The story went viral in Mexico, and someone on your local team has probably already forwarded it to you.

Here is what is true. On October 13, 2026, Office 2021, retail and LTSC, leaves support: it keeps opening, but Microsoft stops shipping security patches. That same month, Office 2016 and 2019 stop connecting to Microsoft 365. We call it the October cliff.

What the headline gets right and wrong

Support means Microsoft fixes bugs and security holes in the program. When it ends, the program stays the same, but every new hole stays open for good.

Office 2021 comes in two flavors. Retail is the perpetual license bought with a key, the one called Home and Business. LTSC, short for Long-Term Servicing Channel, is the volume version for machines you do not want to touch often. Both leave support the same day.

In our experience, the 2021 copies hide in Mexico offices that bought their own PCs from a local distributor in 2021 or 2022 instead of going through headquarters.

Why it matters even if it keeps opening

The most common way into a Mexican office is a rigged Excel or Word file arriving by email as an invoice. Those attacks abuse flaws in Office itself. With patches they close within weeks. Without patches, that file works today and in two years.

Then there is paperwork. Cyber insurance questionnaires ask whether you run unsupported software, and that answer counts the day you file a claim. Group IT audits flag “Office 2021 on forty machines” in red, and the Mexico office has to explain it. Same story as Windows 10 a year ago.

How to find out what Office your Mexico offices run

On one machine: open Word, go to File and then Account. The product name is there: Microsoft 365, Office Home and Business 2021, Office LTSC Professional Plus 2021 or Office 2019. On Spanish Windows those menus read Archivo and Cuenta.

For twenty or fifty machines, nobody should walk desk to desk. An inventory script or your provider’s monitoring pulls it in minutes. We do it within the support plan, no extra charge.

What Word shows	What happens in October 2026
Microsoft 365 or Office 2024	Nothing, it keeps getting patches
Office 2021 or Office LTSC 2021	Leaves support on October 13
Office 2016 or Office 2019	Unsupported and loses its Microsoft 365 connection

Three ways to replace it

Option	How it is paid	Who it fits
Microsoft 365 Apps	Monthly or yearly per user	Most offices; always current and with OneDrive
Office LTSC 2024	Volume license, one time	Plant machines, kiosks, PCs without internet
Office Home and Business 2024	One time per machine	Very small sites that do not want a subscription

Costs, as a market reference to verify: Microsoft 365 for business runs between 8 and 15 USD per user per month, and perpetual Office 2024 is around 250 USD per machine. Mexican distributors invoice in MXN or USD with a CFDI, the Mexican electronic invoice, so the local entity can deduct it.

How to migrate without stopping the office

Batches of five to ten machines per night, after hours, starting with the desks that receive outside files: accounting, purchasing, reception. Uninstall the old one, install the new one, and next morning someone tests the accounting macro before the ticket is closed.

ProcessBi sells the Microsoft licensing you need, runs the batch migrations after hours in any city in Mexico, and transition support is included in the plan. Headquarters gets one report in English.

Let’s talk

And in your Mexico operation?

If you do not know which Office version runs on each machine in Mexico, that is this week’s task. The rest gets done calmly over the nights of October.

We start with a free assessment: version inventory, the license that fits and a batch migration plan, invoiced in MXN or USD.

Book your free assessment — we reply the same business day.