Microsoft Outlook Application Crash due to UCRTBASE.DLL

We have also been fighting this issue for one client in particular. It comes and goes. 

I have been using Sysinternals tools to try and narrow it down. Can you tell me what version of Microsoft Distributable C++ 2015-2019 x64 is installed on the troubled workstations?

14.20.27508.1 is what we have on the bad systems over here. Still havent completely verified it yet, but its a hunch. 

Thanks!

I apologize for the delay. I've listed the installed versions from two of our troubled workstations below. Unfortunately, the exact version that you mentioned isn't listed.

SYSTEM #1

Microsoft Visual C++ 2005 Redistributable 8.0.61001

Microsoft Visual C++ 2005 Redistributable 8.0.59193

Microsoft Visual C++ 2005 Redistributable (x64) 8.0.61000

Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.17

Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.6161

Microsoft Visual C++ 2008 Redistributable – x86 9.0.30729.17

Microsoft Visual C++ 2008 Redistributable – x86 9.0.30729.4148

Microsoft Visual C++ 2008 Redistributable – x86 9.0.30729.6161

Microsoft Visual C++ 2010 x64 Redistributable – 10.0.40219

Microsoft Visual C++ 2010 x86 Redistributable – 10.0.40219

Microsoft Visual C++ 2012 Redistributable (x64) – 11.0.50727

Microsoft Visual C++ 2012 Redistributable (x64) – 11.0.61030

Microsoft Visual C++ 2012 Redistributable (x86) – 11.0.50727

Microsoft Visual C++ 2012 Redistributable (x86) – 11.0.61030

Microsoft Visual C++ 2013 Redistributable (x64) – 12.0.30501

Microsoft Visual C++ 2013 Redistributable (x86) – 12.0.30501

Microsoft Visual C++ 2015 Redistributable (x64) – 14.0.24123

Microsoft Visual C++ 2015 Redistributable (x86) – 14.0.24123

SYSTEM #2

Microsoft Visual C++ 2010 x86 Redistributable – 10.0.40219

Microsoft Visual C++ 2012 Redistributable (x86) – 11.0.60610

Microsoft Visual C++ 2013 Redistributable (x86) – 12.0.30501

Microsoft Visual C++ 2015 Redistributable (x86) – 14.0.23026

Last week, I went so far as to reformat one troubled system and recreate the local profile on another (i.e., straw grasping exercise). Surprisingly, the reformatted PC is worse than before and the jury is still out on the other, but I don't hold out much hope due to the results of the former.

I, too, am coming to a similar conclusion. The DLL (ucrtbase.dll) is part of the Microsoft Visual C++ redistributable, so it's just a matter of determining if its an update to that causing issues and/or an update to Office 2016 and/or Windows that isn't jiving well.

Thank you.

Thanks for the reply.  We are noticing the issue generally diminish, but still have problems here and there.  If I come across anything ground-breaking I'll be sure to post here.

Do you have any suggestion about the cause or the solution yet?

We are experiencing the same issue on many of our workstations since yesterday (Outlook crashes suddenly after typing a few words)

Restarting Windows, updating Office 365 to the latest version, nothing helps.

A strange thing is that the problem doesn't occur on ALL of our workstations, despite they're all created from the same image.

In the Eventlog an Event with EventID 1000 is recorded containing because of the crash:

Faulting application path: C:\Program Files (x86)\Microsoft Office\root\Office16\OUTLOOK.EXE

Faulting module path: C:\WINDOWS\System32\ucrtbase.dll

But why isn't Outlook not using it's own ucrtbase.dll which is in the same folder as Outlook.exe:

C:\Program Files (x86)\Microsoft Office\root\Office16\UCRTBASE.DLL

Does it create a version incompatibility conflict?

The only consistency we've been able to nail down is that the faulting module is always that DLL, which is a software component of Microsoft Visual C++. The rest has truly been a head scratcher because it only affects a subset of our users, Office and Windows versions seemingly do not matter, and we have honestly tried just about every Google solution out there:

• Outlook in Safe Mode
• Roll back Office to known working version
• Roll back Windows to known working version
• Deployment Image Servicing and Management (DISM)
• System File Checker (SFC)
• Disable hardware acceleration
• Recreate Outlook OST file
• Recreate Outlook profile
• Recreate Windows profile
• Reformat computer

We finally bit the bullet and reached out to Microsoft and are actively working with them. Depending on the results there, I will make sure to update everyone here and all of the other message boards I've posted on.

Thank you.