What is outlook.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the outlook.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Outlook.exe file information

Windows Task Manager with outlook
Outlook.exe process in Windows Task Manager

The process known as Microsoft Office Outlook or Microsoft Outlook or Setup.exe

belongs to software Microsoft Office Outlook or Microsoft Office Shared (version 64-bit Setup, 64-bit) or Microsoft Outlook or Microsoft Office Access Setup or Microsoft Office Professional or Microsoft Office Standard (version 2007) or InstallShield or Microsoft Office Enterprise or Microsoft Office Access Setup Metadata MUI

by Microsoft ( or InstallShield Software (

Description: Outlook.exe is not essential for the Windows OS and causes relatively few problems. Outlook.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 13,179,660 bytes (36% of all occurrences), 199,688 bytes and 19 more variants. 
The outlook.exe file is not a Windows core file. Outlook.exe is certified by a trustworthy company. Outlook.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 23% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with outlook.exe, you might want to do the following:

Recommended: Identify outlook.exe related errors

External information from Paul Collins:
There are different files with the same name:

Important: Some malware camouflages itself as outlook.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example Worm:Win32/Alcan (detected by Microsoft), and WORM_GAOBOT.DF (detected by TrendMicro). Therefore, you should check the outlook.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Microsoft's mail program
  Peter   (further information)
It is the exchange, email, calandar and contact manager part of Microsoft Office.
  Ben!   (further information)
Program-1/micros-2/office 10/outlook.exe
  Anne Krueger  
its part of office 2003
Potentially dangerous suite of backdoors, get thunderbird instead.
(Symatec Code: W32.Alcra.F) All Three of You are Incorrect. Outlook.exe, if located in C;/Program Files/outlook, is a worm, and drops a very dangerous and expansive worm along with it. The worm it drops is W32.Spybot.Worm. Visit the link for more details from
  Jared   (further information)
application error
if the error occurs when you are shutting down, its your .pst files.
  Bryan - (answer 8)   (further information)
mail program part of office 2003

Rating chart

Summary: Average user rating of outlook.exe: based on 18 votes with 9 user comments. 11 users think outlook.exe is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks it's neither essential nor dangerous. One user suspects danger. 3 users think outlook.exe is dangerous and recommend removing it. 3 users don't grade outlook.exe ("not sure about it").

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Best practices for resolving outlook issues

A clean and tidy computer is the key requirement for avoiding problems with outlook. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the outlook.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

outlook.exe [all]