[Windows/Mac] Microsoft 365 Troubleshooting/Reinstallation Procedure

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One of the ways to deal with problems such as the app not starting or not working properly is to “reinstall” it.

Reinstalling the Office apps provided by Microsoft 365 is also one of the effective troubleshooting methods.

But if you don’t know how to reinstall or can’t get the installer, you’ll have periods of app inactivity that will stop you from working.

You never know when your app will crash. Check out how to reinstall Microsoft 365 so you don’t panic if something happens.

Troubleshooting to try before reinstalling


Reinstalling is a standard troubleshooting method, but it takes time to reinstall the app.

If you have a problem with Microsoft 365, before reinstalling it, try the easier solutions first.

Check network line

Microsoft 365 has applications and services that operate in an online environment, and various problems can occur if the Internet connection is disconnected or the line speed is slow.

  • cannot send emails in outlook
  • Can’t open files saved in OneDrive
  • Teams chat not updating
  • Camera image stops during web conferencing

If such a problem occurs, check the network connection status.

If there is a stable connection destination such as Wi-Fi or wired LAN nearby, try switching.

App/Computer restart

If your computer or apps are malfunctioning, it is a good idea to restart them first.

There are three restarts to try for Microsoft 365 glitches.

  • restarting the app
  • Restart Microsoft 365 related apps
  • Reboot your PC

First, close the app that is causing the problem and restart it. It’s surprisingly common to fix just this.

If it doesn’t fix it, let’s terminate other Microsoft 365 services once.

Microsoft 365 apps may run in the background or interact with each other, so be sure to open the task manager and end the process as well.

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If it still doesn’t work, try restarting your computer.

Sign out/Sign in

In Microsoft 365, I am signed in to use all apps, but it is also effective to sign out once when there is a problem.

Data such as Outlook, Teams, and OneDrive are stored on the cloud, and you can get the data by signing in.

If the information is not updated even though you are connected to the network, it may be improved by signing out and then signing in again.

[Windows] Repair Office

Windows PCs have the ability to repair installed Office apps.

It may take some time, but it is easier than reinstalling, so if you are using a Windows PC, you should try repairing Office first.

  1. Open Start → Settings.
  2. Click “Apps”.
  3. Select “Apps & Features”.
  4. Select Microsoft 365 from the list and click Change.
  5. Select a repair method and click “Repair” to start the repair.

An overview of the two repair methods is shown in the table below.

Online repair may take a very long time, so we recommend that you try the quick repair first, and then perform the online repair if the problem persists.

Repair method Internet connection feature
quick repair unnecessary Fix many problems in a short time
online repair need Works well for all problems but takes time

Microsoft 365 Reinstallation Instructions


Now, I will explain how to reinstall Microsoft 365 by device.

The procedure for installing Microsoft 365 is the same as for a new installation.

The installer is always available just by signing in to Microsoft 365.

If the product key was registered in your account when you first installed it, you don’t have to enter it every time you reinstall.

The point to be aware of when reinstalling is that you must uninstall first.

If the currently installed Office is different from the Office to be installed from now on, reinstalling while the files of the previous application remain may not work properly.

If you want to reinstall, do not overwrite, uninstall first and then install.

Windows 10

Uninstall procedure

  1. Open Start → Settings.
  2. Click “Apps”.
  3. Select “Apps & Features”.
  4. Select Microsoft 365 from the list and click Uninstall.
  5. After the uninstallation is complete, restart your computer.

Installation instructions

  1. Sign in to Office.com ( https://www.office.com/ ) and click Install Office.
  2. Select language and version and click “Install”.
  3. It will be installed by running the Office installer that has been downloaded to your computer.
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Mac

Uninstall procedure

  1. Open “Applications” from “Finder”.
  2. Drag the app to the Trash.
  3. Restart your Mac.

Installation instructions

  1. Sign in to Office.com ( https://www.office.com/ ) and click Install Office to download the installer.
  2. Run the downloaded “.pkg” file.
  3. Click Continue.
  4. Read the software license agreement and click “Agree”.
  5. Select an installation method and click Continue.
  6. Check the installation area and click “Install”.
  7. If the password entry screen appears, enter the password you use to log in to your Mac.
  8. When the installation is complete, click “Close” to finish.

Common causes of Microsoft 365 glitches


Problems with Microsoft 365 apps can be solved by uninstalling and reinstalling.

However, considering the time and effort involved in the work, it is best to avoid problems as much as possible.

Problems with Microsoft 365 can be prevented to some extent depending on how you use it.

Here are two common causes, so it’s a good idea to check the status of your Microsoft 365 apps from time to time.

Adding unnecessary add-ins

Add-ins are programs that add functionality to Office apps.

When using other apps, you may be asked to add add-ins, and you may find that the number of add-ins has increased before you know it.

The add-in itself is convenient, but if a large number of add-ins are added or unnecessary add-ins are running, it will cause problems such as slowing down, freezing, or “no response” of the application. .

It’s best not to add add-ins you don’t need, but check your list of add-ins from time to time and disable any add-ins you don’t need.

Steps to disable add-ins in Excel

  1. Start Excel and click File > Options.
  2. Click Add-ins.
  3. Under Manage, select COM Add-ins and click Go.
  4. Uncheck unnecessary add-ins.
  5. Click OK.

Outdated app version

If the version of the app is old, it may cause various problems and troubles, so update to the latest version and use it.

Microsoft 365 is always updated to the latest version, but it may be stuck with an old version on a device you haven’t used for a long time or a computer you use offline.

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Check the version regularly and update.

Steps to update Microsoft 365 Apps immediately

  1. Launch an Office app and open Accounts.
  2. Click Update Options.
  3. Click Update Now to download the update.

For those who are considering introducing Microsoft 365

With the end of support for Office 2019, there may be some people who are wondering about replacing Office licenses.

If you’re going to buy from now on, Microsoft 365 is definitely recommended.

Microsoft 365 is the successor to Office 365. Windows OS and advanced security features have been added to Office 365 services.

By enabling data encryption and device management, it is possible to have all the functions necessary for a telework environment with this one.

The contract benefits of Mictosoft 365 are as follows.

  • Cloud storage and communication tools are bundled and advantageous
  • Get the latest version of Office
  • Can be used for as long as you want
  • Can be installed on multiple devices
  • Easy license management

If you are considering introducing Microsoft 365, please consult with NEC Networks & System Integration.