Outlook 2016 crashing (riched20.dll)


Outlook 2016 (v1609 build 7369.21.20) keeps crashing while being used. The Event Viewer reveals:

Faulting application name: OUTLOOK.EXE, version: 16.0.7369.2120, time stamp: 0x58bf7ba8 Faulting module name: riched20.dll, version:, time stamp: 0x58bac1cd Exception code: 0xc0000005 Fault offset: 0x0000a916 Faulting process id: 0x1d94 Faulting application start time: 0x01d2b38ba56df461 Faulting application path: C:\Program Files (x86)\Microsoft Office\root\Office16\OUTLOOK.EXE Faulting module path: C:\Program Files (x86)\Common Files\Microsoft Shared\Office16\riched20.dll Report Id: db2987a2-1f95-11e7-b766-28d244394268 Faulting package full name: %14 Faulting package-relative application ID: %15

Is there any way to fix this issue? Thank you

asked on Super User Apr 13, 2017 by Alex • edited Apr 13, 2017 by Ramhound

2 Answers


I experienced this issue when browsing folders with more than 10000 items. Work around is to group mail into sub-folders (previous years etc). HTH.

answered on Super User Jun 8, 2017 by Neil McIntyre
  1. Scan your system for malware and spyware.

  2. Go to “%windir%\system32\” and check whether these 2 files exist: riched20.dll, riched32.dll.

If they do, please open a command prompt with administrator privilege and run the following command to re-register them:

Regsvr32 %windir%\system32\riched20.dll /i Regsvr32 %windir%\system32\riched32.dll /i

After 1 and 2, if the problem persists, reinstall/use repair option for Office so the .dlls are actually replaced with default ones.

answered on Super User Apr 13, 2017 by Overmind

User contributions licensed under CC BY-SA 3.0