What is mapisp32.exe?

The genuine mapisp32.exe file is a software component of Microsoft Windows™ Messaging Subsystem Spooler by Microsoft.
"mapisp32.exe" is a file that is part of Windows and known as the 32-bit interface subsystem spooler for the Microsoft Windows Messaging Subsystem Spooler. It resides in Windows Messaging, Microsoft Exchange, and Outlook software. The file sends pending messages within those three listed applications. It spools all pending, outgoing messages and sends them automatically when ready or connected to the internet. Microsoft started in 1975 with BASIC programming for Altair 8800 systems and has developed innovative software, products, and services for consumers and businesses worldwide. The company continues to grow and provides technology that makes life easier, whether by product or by software.

MAPISp32 stands for Mail Application Programming Interface Spooler 32 bit

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 mapisp32.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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Mapisp32.exe file information

Windows Task Manager with mapisp32
Mapisp32.exe process in Windows Task Manager

The process known as Microsoft Windows™ Messaging Subsystem Spooler belongs to software Microsoft Exchange or Microsoft Office (version 2000 SR-1) by Microsoft (

Description: Mapisp32.exe is not essential for the Windows OS and causes relatively few problems. The file mapisp32.exe is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 35,328 bytes (63% of all occurrences), 35,840 bytes or 36,864 bytes. 
The program has no visible window. Mapisp32.exe is not a Windows core file. The process listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 50% dangerous; however you should also read the user reviews.

Uninstalling this variant: In the event of any problems with mapisp32.exe, you may also remove the entire program Microsoft Office 2000 SR-1 or Microsoft Office 2000 Premium using Windows Control Panel.

Recommended: Identify mapisp32.exe related errors

If mapisp32.exe is located in the C:\Windows\System32 folder, the security rating is 51% dangerous. The file size is 24,064 bytes (50% of all occurrences), 27,408 bytes and 4 more variants. The program is not visible. It is not a Windows core file. It is an unknown file in the Windows folder.

Important: Some malware camouflages itself as mapisp32.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the mapisp32.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

This is part of the Microsoft Outlook application
mapisp32.exe belongs to Microsoft Windows Messaging Subsystem Spooling Application, often referred to as the MAPI Spooler (Mail Application Programming Interface). The MAPI spooler sends the messages that are waiting for despatch in Microsoft Exchange, Windows Messaging, or Outlook 97/98/2000 Outbox.

Summary: Average user rating of mapisp32.exe: based on 7 votes with 2 user comments. 7 users think mapisp32.exe is essential for Windows or an installed application.

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Best practices for resolving mapisp32 issues

A clean and tidy computer is the key requirement for avoiding problems with mapisp32. 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 mapisp32.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

mapisp32.exe [all]