What is ntmulti.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 ntmulti.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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Ntmulti.exe file information

Windows Task Manager with ntmulti
Ntmulti.exe process in Windows Task Manager

The process known as IBM Lotus Notes/Domino belongs to software Lotus Notes or Multi-user Cleanup Service or IBM Lotus Notes/Domino by IBM (

Description: Ntmulti.exe is not essential for the Windows OS and causes relatively few problems. Ntmulti.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 53,248 bytes (30% of all occurrences), 53,297 bytes, 57,393 bytes or 58,760 bytes. 
The program has no visible window. It is not a Windows core file. The program can be uninstalled in the Control Panel. Therefore the technical security rating is 30% dangerous, however you should also read the user reviews.

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

Recommended: Identify ntmulti.exe related errors

If ntmulti.exe is located in a subfolder of C:\, the security rating is 30% dangerous. The file size is 53,248 bytes (50% of all occurrences), 57,393 bytes or 38,504 bytes. The program is not visible. The ntmulti.exe file is not a Windows system file.

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

Important: Some malware camouflages itself as ntmulti.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the ntmulti.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

IBM Lotus Notes Multi User Cleanup Service (deletes roaming user data for inactive users)
  Chris   (further information)
Service integrated in Lotus Domino and Lotus Notes. It's designed to be used by the client code along with the Roaming User feature in Notes/Domino 6.x
  pleonardi   (further information)
Polls for a file every 3 seconds. This task is meant to clean up a Lotus Notes roaming data directory,
  Frederick Legault   (further information)
I do not anything but I have in my "Window Task Manager"
Only required bt Lotus Notes
  DW   (further information)
Lotus Notes service, non essential, caused svchost to continually crash on my Thinkpad. Renamed file extension, Lotus Notes still running fine and no more system crashes
did not happen until I installed notes
If you running IBM Lotus Note, this service is necessary to run it. It is not bad worm or some thing harmful to computer.
  Shahbaz Ahmed  
Needed for Lotus Notes
  Mike D.  
it's a Lotus Notes process
  Richard Graham  
It is incompatible with links to folders in email and causes "Unable to invoke program" error message. Fixed for LNotes 6.5.3
  Jere Fuqua   (further information)
Lotus Notes Roaming user clean up service for Notes 6.x - essential only if roaming is activated
My Lotus Notes works fine without ntmulti.exe
  Percy Schott  
Goes with Lotus Notes. Essential only if multiuser / roaming activated. Otherwise, Notes (8.5) works fine without it.
  AL Bailly  

Rating chart

Summary: Average user rating of ntmulti.exe: based on 15 votes with 14 user comments. 7 users think ntmulti.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 4 users think it's neither essential nor dangerous. One user suspects danger. One user is not sure about it.

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Best practices for resolving ntmulti issues

A clean and tidy computer is the key requirement for avoiding problems with ntmulti. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the ntmulti.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

ntmulti.exe [all]