What is msosync.exe?

The genuine msosync.exe file is a software component of Microsoft Office by Microsoft.
Microsoft Office is a suite of client and server software by Microsoft. MSOSYNC.EXE is a file that is associated with the Microsoft Office Document Cache component of the Office suite, and does not pose a threat to your PC.

Developed by Microsoft and first released in 1990, Microsoft Office is a suite of server and client software that is produced in several versions geared towards a wide range of computing environments and end-users. Office is available in 102 different languages, and includes several desktop apps, mobile apps and server applications including Office Lens, Office Remote, Microsoft Word, Microsoft Excel, Microsoft SharePoint and Skype for Business Server.

The Microsoft Corporation is a leading American technology giant that develops, sells and supports personal computers, consumer electronics and computer software. The company ranked as the world's largest software maker by revenue and most valuable brands in 2016, and earned a revenue of $89.95 billion in 2017. Microsoft has made some major acquisitions over the years such as LinkedIn in 2016 for $26.2 billion, Skype Technologies for $8.5 billion in 2011 and Nokia's devices and services division.

MsOSync stands for Microsoft Office Sync

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 msosync.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 msosync.exe related errors

Msosync.exe file information

Windows Task Manager with msosync
Msosync.exe process in Windows Task Manager

The process known as Microsoft Office Document Cache belongs to software Microsoft Office Shared (version 64-bit Setup, 64-bit MUI) 2010, 64-bit MUI 2010) or Microsoft Office Professional Plus (version 2010, 2013) or Microsoft Office Access Setup Metadata MUI or Microsoft Office (version 365 - en-us, 365 ProPlus - en-us, 365 - de-de) or Microsoft Lync MUI (version 2013) or Microsoft Office Shared Setup Metadata MUI or Microsoft Office Professional (version 2013) or Microsoft Office Home and Student (version 2013) by Microsoft (

Description: Msosync.exe is not essential for the Windows OS and causes relatively few problems. Msosync.exe is located in a subfolder of "C:\Program Files (x86)" (typically C:\Program Files (x86)\Microsoft Office\Office14\ or C:\Program Files\Microsoft Office 15\root\office15\). Known file sizes on Windows 10/8/7/XP are 720,064 bytes (18% of all occurrences), 719,672 bytes and 30 more variants. 
The program is not visible. The msosync.exe file is digitally signed. The program starts when Windows starts (see Registry key: Run, RunOnce, TaskScheduler). The file is not a Windows core file. Therefore the technical security rating is 34% dangerous, but you should also take into account the user reviews.

Uninstalling this variant: You can uninstall Microsoft Office Groove MUI 2010 or Microsoft Office Shared 64-bit Setup, or try to get help from the software vendor. Click on Microsoft Office Groove MUI 2010 or Microsoft Office Shared 64-bit Setup in the Windows Control Panel (Software or Programs section) to uninstall it, or click on to visit the vendor's website.

Recommended: Identify msosync.exe related errors

If msosync.exe is located in a subfolder of the user's profile folder, the security rating is 59% dangerous. The file size is 720,064 bytes. It can change the behavior of other programs or manipulate other programs. The program is not visible. The file is digitally signed. The application starts when Windows starts (see Registry key: Run, RunOnce, TaskScheduler). Msosync.exe is not a Windows core file.

Uninstalling this variant: You could uninstall Microsoft Office Shared 64-bit MUI 2010 or Microsoft Office Groove MUI 2010 from your computer using the Control Panel applet Uninstall a Program.

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

Sage SalesLogix CRM Software
  David   (further information)
MSOSYNC.EXE stands for Microsoft Office Synchronization. It caches document for faster viewing, e.g. Word document, Excel spreadsheet, or a PowerPoint presentation.
"Msosync.exe" is the Microsoft Office Document Cache (ODC) synchronizer and cache management program, introduced with Office 2010 to enhance interaction of Excel, Word, and PowerPoint with SharePoint Workspace (SPW), OneDrive for Business (ODFB), and other network and Web-based collaboration systems. It installs in "C:\Program Files\Microsoft Office\OfficeVV\msosync.exe", ("VV" being the version indicator of 14 for Office 2010, or higher). The registry subkey valueOfficeSyncProcess in HKCU\Software\MicrosoftWindows\CurrentVersion\Run causes it to start when Windows boots up. It has no visible window but obeys settings made in the Office Upload Center GUI. It keeps updated versions of Word, Excel, and PowerPoint documents from external servers readily available in local storage for ease of re-use. When an Office document cached by "msosync.exe" is in a SharePoint workspace or has come from OneDrive for Business, those have their own synchronization routines whose interaction with "msosync.exe" can cause severely elevated CPU consumption.

Summary: Average user rating of msosync.exe: based on 4 votes with 3 user comments. 3 users think msosync.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving msosync issues

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

msosync.exe [all]