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Troubleshooting Guide

When Microsoft Outlook
Won’t Open

You click the Outlook icon and… nothing. No window, no error, no sign that anything happened. It’s a well-known Outlook quirk — and you can fix it yourself in about a minute.

Windows 10 & 11
Takes about 1 minute
No password needed

💭 Why This Happens

When you close Outlook, it sometimes doesn’t shut down all the way. It keeps running quietly in the background, where you can’t see it — no window, and no icon on the taskbar.

Windows won’t open a second copy of Outlook while that hidden one is still running, so clicking the icon appears to do absolutely nothing. Getting rid of the hidden copy is all it takes.

This is a long-standing quirk in Microsoft Outlook itself, and it happens on Outlook installations all over the world. It is not a fault with your email account, your mailbox, your internet connection or your hosting — and there is no setting we can switch on to stop Outlook doing it. The good news: it’s harmless, nothing gets deleted, and it clears in under a minute.
Two ways to fix it — pick either
The easy way

Just restart the computer

A restart clears the hidden copy of Outlook automatically and fixes this almost every time. If you’d rather not follow the steps below, do this instead — you get the same result.

Start → the power icon → Restart. See the last section of this guide, because Restart and Shut down are not the same thing.

The quick way · this guide

Close the hidden Outlook

Takes about a minute and leaves everything else you’re busy with open — no waiting for the PC to shut down and start up again, and nothing else on your screen gets closed.

The six steps below show you exactly where to click.

The Six Steps
1
Step One

Open Task Manager

Ctrl + Shift + Esc Press all three at the same time Device Manager Network Connections Computer Management Terminal Task Manager Settings File Explorer Right-click the Start button Click this
Left: the keyboard shortcut. Right: the menu, if you’d rather use the mouse.

Hold down Ctrl and Shift together, and while still holding them, press Esc. All three keys sit on the left side of your keyboard. Task Manager opens straight away.

Prefer the mouse? Right-click the Start button — the Windows logo on your taskbar — and choose Task Manager from the list that appears.

The keyboard shortcut works on every version of Windows, so it’s the one worth remembering.
2
Step Two

Make sure you’re on “Processes”

Task Manager Processes Performance App history Startup apps Users Details Services Processes Type a name to search Run new task End task Name Status CPU Memory Disk Network Apps (5) Microsoft Edge (14) 2.1%412.3 MB 0.1 MB/s0 Mbps Microsoft Outlook 0.4%268.7 MB 0 MB/s0 Mbps W Microsoft Word 0%96.4 MB 0 MB/s0 Mbps Task Manager 1.2%38.2 MB 0 MB/s0 Mbps Windows Explorer 0.3%74.9 MB 0 MB/s0 Mbps Background processes (86) Antimalware Service Executable 3.4%184.1 MB COM Surrogate 0%4.2 MB Microsoft Outlook 0%41.2 MB Print Spooler 0%6.8 MB Windows Security notification icon 0%2.9 MB
“Processes” is the first item in the left-hand menu.

Task Manager shows you everything your computer is running right now. Down the left-hand side is a menu — click Processes at the top of it.

Nine times out of ten it’s already selected. If Processes is highlighted, you’re in the right place.

On some older Windows 10 PCs, Task Manager opens as a small plain box with a short list and no menu down the left. If that happens, click More details at the bottom of that box first, then carry on.
3
Step Three

Search for Outlook

Task Manager Processes PerformanceApp history Startup appsUsers DetailsServices Processes outlook Run new task End task Name CPU Memory Disk Network Apps (1) Microsoft Outlook 0.4%268.7 MB 0 MB/s0 Mbps Background processes (2) Microsoft Outlook 0%41.2 MB 0 MB/s0 Mbps Microsoft Outlook Communications 0%12.8 MB 0 MB/s0 Mbps Type outlook here These are the hidden copies
Everything that isn’t Outlook disappears from the list.

There are usually a hundred or more items in this list, so don’t go hunting through it. Click into the search box at the top and type outlook

The list shrinks to just the Outlook items — normally one, two or three of them. Some are named slightly differently, like Microsoft Outlook Communications. They all count.

Searching first is the safety net: once only Outlook is on screen, there is nothing left to click by mistake.
4
Step Four

Click the Outlook line, then click “End task”

Task Manager Processes PerformanceApp history Startup appsUsers Details Processes outlook Run new task End task Name CPU Memory Disk Network Apps (1) Microsoft Outlook 0.4%268.7 MB 0 MB/s0 Mbps Background processes (2) Microsoft Outlook 0%41.2 MB Microsoft Outlook Communications 0%12.8 MB 1 2 click the line, then the button
Select the line first (1), then click End task (2).

Click once on a line that says Microsoft Outlook — it turns blue to show it’s selected. Then click the End task button in the top right corner.

The line vanishes from the list. That’s all that happens: no warning, no confirmation box, and nothing is deleted.

Only ever end something that says Outlook. If you end the wrong item — particularly anything with Windows in its name — your PC can sign you out or restart on the spot, without asking and without saving. That’s exactly why we searched for “outlook” first: if it’s on your screen now, it’s safe to end.
5
Step Five

Repeat until the list is empty

Task Manager Processes PerformanceApp history Startup appsUsers Processes outlook Run new task End task Name CPU Memory Disk Network Nothing left in the list This is what done looks like
An empty list is the finish line for this step.

Outlook often leaves two or three copies of itself running, so after the first one disappears there may still be others below it. Click the next one, click End task, and keep going.

When the list is completely empty, you’re done — that means no copy of Outlook is running anywhere on the computer.

6
Step Six

Close Task Manager and open Outlook again

Click the ✕ in the very top right corner of Task Manager to close it. Wait about ten seconds — Windows needs a moment to tidy up — then open Outlook the way you normally do.

It should start up as usual. Give it a minute the first time; Outlook often takes a little longer to load after this.

If Outlook keeps doing this to you, the next section is worth two minutes of your time — a weekly restart prevents most of it.
Restart, Don’t Shut Down

🔄 The Most Useful Two Minutes You Can Give Your PC

Most of the odd little faults people phone us about — an app that won’t open, printing that stops working, a computer that has become slow for no reason — are cleared by a restart. It is genuinely the single most useful thing you can do for your own machine.

Search Your name Sleep Shut down Restart Not this one Click this
Start → the power icon → Restart.

Why “Shut down” is not the same as “Restart”

This surprises almost everyone. Windows 10 and 11 have a feature called Fast Startup, switched on by default. When you shut down, Windows doesn’t really switch everything off — it saves a snapshot of how things are and loads that same snapshot back the next morning, so the PC starts faster.

The catch: whatever was stuck yesterday gets loaded back in along with the snapshot. Shutting down every evening can leave a problem in place for weeks. Restart is the only option that genuinely clears the computer’s memory and starts fresh — so when something is misbehaving, always choose Restart.

What a restart actually clears up

How often you should do it

At least once a weekPick a moment that suits you — Friday before you leave, or first thing Monday. Make it a habit and you will simply have fewer problems.
Whenever something is oddAn app won’t open, printing has stopped, things have gone slow, a website won’t load. Restart before spending twenty minutes troubleshooting — it fixes it more often than not.
When Windows asksIf you see a message about a restart being needed to finish updates, do it that day. Don’t keep clicking “later” for a month.
Before you call usIf it’s still broken after a restart, we know it’s something real — and we can skip straight past the obvious checks.
Leaving your PC switched on overnight isn’t the problem, and switching it off every night isn’t the fix — it’s the restart that does the work, not the switching off. Whichever you prefer, just make sure a proper Restart happens about once a week.

📞 If Outlook Still Won’t Open

  1. Restart the computer, if you haven’t yet. Start → power icon → Restart, as above. Then try Outlook again.
  2. Check you’re not out of disk space. Outlook can refuse to start when the drive is completely full.
  3. Get in touch. Call or email us and mention that you’ve already worked through this guide and restarted — that tells us straight away where to look next, and saves you being asked to do it all over again.
✅

That’s It — You’re Sorted

Nothing about your mailbox, your settings or your saved emails has changed, and this is safe to repeat any time Outlook does it again. Need a hand? Contact Experience IT — call 078 247 2221 or email support@experience-it.co.za