This document explains how to fix Microsoft Outlook error code 0x80040126 if it is not working properly or throwing an error while installing, updating,  launching/opening, performing action like sending or receiving emails, configuring emails etc.

The error message may look like:0x80040126 the operation cannot be performed because the connection to the server is offline

This solutions applies for following version of Microsoft Outlook:

  • Outlook 2007
  • Outlook 2010
  • Outlook 2013
  • Outlook 365
  • Outlook 2016
  • Microsoft Office (2013/365/2016)
Error InformationError Descripton
Error 0x80040126 Outlook Overview
0x80040126 Error Code Log
Avg. Time to Resolve Issue   50 mins
Difficulty Hard
Log Name: Microsoft Outlook <version> 5.20
Source: Mail size Conflict
Event ID: 9722
Operating System
  • Windows 7
  • Windows 8
  • Windows 10
Level: System Level
User: <Outlook username>
Description:
  • Faulting Application Name: Microsoft Outlook <Application name>, version: 8.1.0447.31363, time stamp: 0×11053790
  • Faulting module name: Outlook  event.dll, version: 7.2.6326.62940
  • Exception code: 0xb03a651c
  • Fault offset: 0xe01d416e
  • Faulting process ID: 0×675
  • Faulting application start time: 0x09febg7f14372921
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Program Files (x86)\Microsoft Outlook\<appname>
  • Report ID: a2e42e14-9796-18a3-3639-6592bac5d281

Cause of 0x80040126 Outlook Error Code

  • Proxy issue
  • Microsoft Outlook internal Application Conflict

How to fix Outlook Error 0x80040126

Step 1: Check Windows Firewall Settings

1. In Start Search box type “Firewall.cpl” (without quotes)
Open Windows Firewall2. Click on Windows Firewall.
3. Click on “Turn Windows Firewall On or Off
Turn Windows Firewall on or off4. In Private network Setting, select “Turn off Windows firewall (not recommended)
5. Do the same for Public Network Setting.
Disable Windows Firewall6. Press OK.
Note: After the issue is resolved you must turn the Windows Firewall on.

Step 2: Disable any installed Antivirus/Malware/Adware Program Temporarily

Some times Antivirus/Malware/Adware programs mark Microsoft office installer files as Spam and block it from installing. Please refer your vendors website for disabling it temporarily. Once installation is done you can activate it again.

In most cases Outlook error code 0x80040126 should be resolved by following above steps. If however the issue still persists it means there is some critical issue with your system which needs to be fixed manually and is recommended to be done by an experienced Computer Technician.

You can chat one-on-one with one of our Outlook Support Representative 24/7 by clicking on the Chat button.

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Last Updated: 05/02/2016
Solution ID: 605621

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