What is osa.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 osa.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.

Click to Run a Free Scan for osa.exe related errors

Osa.exe file information

Windows Task Manager with osa
Osa.exe process in Windows Task Manager

The process known as Microsoft Office Wrapper or Microsoft Office XP component or Microsoft Office (version 2003 component)

belongs to software Microsoft Office (version 97,, 97, Professional Edition, 97, Standard, 2003, 97, Standard Edition) or Microsoft Office XP or Microsoft Excel (version 97) or Microsoft Word (version 97) or Microsoft Project (version 98) or Microsoft Office XP Professional with or Microsoft Office XP Professional or Microsoft Office XP Standard

by Microsoft (

Description: Osa.exe is not essential for Windows and will often cause problems. Osa.exe is located in a subfolder of "C:\Program Files"—mainly C:\Program Files\Microsoft Office\Office\. Known file sizes on Windows 10/8/7/XP are 51,984 bytes (57% of all occurrences), 83,360 bytes, 61,440 bytes, 51,712 bytes or 99,672 bytes. 
The osa.exe file is not a Windows core file. The application starts when Windows starts (see Registry key: MACHINE\User Shell Folders, User Shell Folders, Shell Folders, DEFAULT\User Shell Folders). The program is not visible. Therefore the technical security rating is 29% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you encounter difficulties with osa.exe, you can do the following:
  1) uninstall the software Microsoft Office using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program)
  2) visit the support page
  3) search for an update on the vendor’s website.

Recommended: Identify osa.exe related errors

If osa.exe is located in a subfolder of the user's profile folder, the security rating is 56% dangerous. The file size is 759,808 bytes. There is no file information. It is not a Windows system file. The program has no visible window. Osa.exe is able to record keyboard and mouse inputs, hide itself and monitor applications.

External information from Paul Collins:

Important: Some malware camouflages itself as osa.exe. Therefore, you should check the osa.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

I dont have Powerpoint,Office,him uses big CPU usage disable him!
Hasn't been used in Office since Office XP. Not used in Office 2007 and above.
  Franklin   (further information)
After loading, prevented my pc from shutting down proper, repeatedly forced me to power reset, searched under SAFE boot multiple times, downloaded new antiviruses, didn't know it existed until loggedc in under 2nd admin acct and found it on dsktop. 2nd acct was not running it , and worked fine. installed as part of Powerpoint update, I don't have powerpoint!
  Gary - Minneapolis Minnesota  
End the process by going to TaskManager- select OSA.exe - Right Click- Endprocess. Your problem will solved.
100% CPU upon startup, a serious computer slow-me-downer
do not delete file. Simply delete its shortcut.
Not dangerous, but Office 97 won't run until I disable it.
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of osa.exe: based on 81 votes with 9 reviews. 25 users think osa.exe is essential for Windows or an installed application. 4 users think it's probably harmless. 19 users think it's neither essential nor dangerous. 9 users suspect danger. 24 users think osa.exe is dangerous and recommend removing it. 7 users don't grade osa.exe ("not sure about it").

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Best practices for resolving osa issues

A clean and tidy computer is the key requirement for avoiding problems with osa. 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 osa.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

osa.exe [all]