Your Outlook will not start, Word crashes on every document, or Excel opens to a grey rectangle and sits there. Somebody has told you to uninstall the whole of Office and put it back.
Hold on. There is a repair button sitting in Windows that almost nobody uses, and it keeps your account, your settings and your files exactly where they are.
I checked whether that button is actually available on this machine before writing, because on some installations Windows hides it and the article would be useless to you.
Two repairs, not one
They look like the same button and they do very different amounts of work.
⚡ Microsoft describes the fast one on its repair page: "The faster Quick Repair option is also available, but it only detects and then replaces corrupted files."
⭐ That is the whole job it does. Broken file in, good file out, nothing else touched.
⚠️ The thorough one is a different animal. Microsoft's instruction is to "select Online Repair > Repair to make sure everything gets fixed."
⛔ Online Repair effectively reinstalls Office in place. It downloads what it needs, so it takes far longer and it needs a connection.
Where the button lives
Two routes, because Microsoft names them separately by Windows version.
⭐ Documented by Microsoft for Windows 11: "Right-click the Start button (lower-left corner) and select Installed apps", then find the product, "click the ellipses, and select Modify".
⚡ On Windows 10 it is the older menu: "Right-click the Start button (lower-left corner) and select Apps and Features", then "Select the Microsoft 365 or Office product you want to repair and select Modify."
⚠️ The word you are looking for is Modify, not Repair. Repair only appears after you click Modify, which is why people say they cannot find it.
⛔ Read on this machine: the Microsoft 365 entry carries a working Modify option and it is not blocked. That is what you should see too.
Which one to run first
Ours, and the order saves you an hour more often than not.
⚡ Always Quick Repair first. It takes a few minutes, needs no connection, and fixes the commonest cause. On a machine I am not sitting in front of, I never start with the slow one.
⭐ Use the machine normally for a day before deciding it did not work. A crash that happened once is not proof of anything.
⚠️ Then Online Repair, and give it an afternoon. It is closer to a reinstall than to a repair, and it will want to download a lot.
⛔ Close every Office app first. Outlook in particular holds files open, and a repair that has to fight it takes longer or fails.
What a repair does not touch
The reassurance, because this is what stops people trying it.
⭐ Your emails stay. They live in your mailbox and in a local data file, and repairing the program does not go near either.
⚡ Your account stays signed in, and your license is untouched.
⚠️ Your documents are not involved at all. Repair works on the program, not on anything you made with it.
⛔ Ours, and worth saying plainly: add-ins sometimes come back disabled, and a very old one may not survive an Online Repair. That is usually an improvement.
When repair is the wrong tool
Four cases where it will not help you.
⚡ You cannot sign in at all. That is an account problem, not a broken program.
⭐ One mailbox misbehaves and the others are fine. That points at the profile or the mailbox rather than at Office.
⚠️ Outlook opens but receives nothing. That has a list of its own and none of it is a repair.
⛔ Or the whole machine is unstable, not just Office. Repairing one program on a failing PC is treating the symptom.
The Outlook-specific step people miss
Worth doing before an Online Repair, because it is faster.
⭐ Outlook keeps a profile, which is separate from your account and from the program. A damaged profile produces exactly the symptoms of broken software.
⚡ A new profile is created in minutes and the old one is left in place, so nothing is lost if it does not help.
⚠️ If a brand new profile works, the fault was never Office. You have saved yourself an afternoon.
⛔ And if Outlook will not open far enough to reach any of this, that is a narrower problem. Getting it to start at all comes first.
Before you do any of it
Three checks that take two minutes together.
⚡ Restart the machine properly. Not sleep and wake. A surprising number of Office faults are one stuck process.
⭐ Then start the app holding Ctrl, which offers to open it without add-ins. If it behaves that way, an add-in is your fault and repair is not needed.
⚠️ Then check for an Office update. Microsoft fixes crashes in updates constantly, and you may be one restart away.
⛔ Only after those three is a repair worth the time.
Status: Microsoft's repair page quoted, 28 August 2026, with the local Office entry checked here. ⛔ No repair was run and nothing about the installation was modified.
What is the difference between Quick Repair and Online Repair?
Microsoft says Quick Repair "only detects and then replaces corrupted files", which is why it is fast and needs no connection. Online Repair is described as the way "to make sure everything gets fixed", and it is much closer to reinstalling Office in place. Run Quick Repair first.
Will repairing Office delete my emails?
No. Your mail lives in your mailbox and in a local data file, and repairing the program does not touch either. Your account stays signed in and your license is unaffected. Add-ins sometimes come back disabled, which is the only real side effect.
Where is the repair button for Office?
It is behind Modify, not labeled Repair. On Windows 11 Microsoft says to right-click Start, select Installed apps, find the Microsoft 365 or Office product, click the ellipses and select Modify. On Windows 10 the same route runs through Apps and Features.
Should I uninstall and reinstall Office instead?
Rarely. Online Repair does the same work while keeping your account, license and settings in place, and it saves you finding your product key or sign-in again. Reinstalling is the step to reach for only after a repair has genuinely failed.
The Short Version
- There are two repairs. Quick Repair replaces corrupted files only.
- Online Repair is closer to a reinstall and needs a connection.
- The button is called Modify. Repair appears after you click it.
- Windows 11 uses Installed apps. Windows 10 uses Apps and Features.
- Repair does not touch your emails, your account or your documents.
- Close every Office app first, especially Outlook.
- Start the app holding Ctrl to rule out an add-in before repairing anything.
- A damaged Outlook profile looks exactly like broken software.
Where to Next
If the crash took your work with it, deal with that before you repair anything. The recovery pane appears once and most people close it.
Restart the machine properly before anything else. Not sleep and wake, a real restart.
Then hold Ctrl while starting the app. If it behaves without add-ins, you have found the fault and no repair is needed.
If it still misbehaves, run Quick Repair and then use the machine for a day before judging it.
Leave Online Repair until that has failed, and give it an afternoon rather than ten minutes.
And if a repair has ever fixed something for you that you were sure needed a reinstall, tell me which app in the comments. That button is under-used and the stories would help.
Isaac Smith is the founder and editor of PC Glance, a website that covers computers, laptops, and technology. He is a tech enthusiast and a computer geek who loves to share his insights and help his readers make smart choices when buying tech gadgets or laptops. He is always curious and updated about the latest tech trends.