Outlook Error Fix
Outlook Error Fix guides from WinAssistPro help administrators and end users resolve Outlook failures fast. This category includes 150 documented error codes with symptoms, root causes, and verified repair workflows. Whether you manage a tenant or troubleshoot a single workstation, these pages are structured for Bing search, Copilot answers, and direct IT reference.
Use this Outlook knowledge base to diagnose failures, reduce ticket volume, and apply fixes that match real-world Microsoft support patterns.
What is Outlook error troubleshooting?
Outlook error troubleshooting is the process of mapping a failure code or message to a reliable fix path. Microsoft products surface hexadecimal codes, HRESULT values, and named errors when configuration, network, licensing, or file integrity blocks an operation. WinAssistPro documents those codes in plain language so you can move from symptom to solution without reading fragmented forum threads.
How does WinAssistPro organize Outlook errors?
Each Outlook entry includes the exact error string users search for, a summary of symptoms, likely causes, a numbered repair sequence, FAQ answers, and structured data for search engines. Pages are modular: every H2 block can stand alone, which helps Bing AI and Copilot quote accurate guidance.
How to fix Outlook errors quickly
- Locate the Outlook error code
Copy the exact code from the dialog, Event Viewer, or Outlook log before opening the matching WinAssistPro article.
- Apply the standard repair order
Restart the app, install updates, run Online Repair, then follow the category-specific fix on the error page.
- Validate and document the fix
Retest with the original user workflow and record the resolution in your internal runbook for future Outlook tickets.
Complete Outlook error index
- Outlook Error 0x8004010F Outlook Data File Cannot Be Accessed
- Outlook Error 0x8004010E Outlook Not Enough Memory
- Outlook Error 0x80040111 Outlook Interface Not Supported
- Outlook Error 0x80040112 Outlook Invalid Class String
- Outlook Error 0x80040113 Outlook Invalid Query
- Outlook Error 0x80040114 Outlook Invalid Context
- Outlook Error 0x80040115 Outlook Wrong Server Type
- Outlook Error 0x80040116 Outlook Server Not Available
- Outlook Error 0x80040117 Outlook Invalid User Name
- Outlook Error 0x80040118 Outlook Logon Failed
- Outlook Error 0x80040119 Outlook Unable to Complete Operation
- Outlook Error 0x8004011A Outlook MAPI Unavailable
- Outlook Error 0x8004011B Outlook Network Failure
- Outlook Error 0x8004011C Outlook Unable to Open Message Store
- Outlook Error 0x8004011D Outlook Invalid Entry ID
- Outlook Error 0x8004011E Outlook Invalid Object Type
- Outlook Error 0x8004011F Outlook Not Found
- Outlook Error 0x80040154 Outlook Class Not Registered
- Outlook Error 0x800CCC0E Outlook Connection to Server Failed
- Outlook Error 0x800CCC0F Outlook Connection Dropped
- Outlook Error 0x800CCC13 Outlook Socket Write Error
- Outlook Error 0x800CCC15 Outlook Socket Read Error
- Outlook Error 0x800CCC18 Outlook SMTPS Server Timeout
- Outlook Error 0x800CCC19 Outlook Timeout Waiting for Server
- Outlook Error 0x800CCC1A Outlook Secure Authentication Failed
- Outlook Error 0x800CCC67 Outlook Your Server Does Not Support SSL
- Outlook Error 0x800CCC78 Outlook Address Not Recognized
- Outlook Error 0x800CCC79 Outlook Server Does Not Support Authentication
- Outlook Error 0x800CCC80 Outlook Server Does Not Support STARTTLS
- Outlook Error 0x800CCC90 Outlook Incoming POP3 Error
- Outlook Error 0x800CCC91 Outlook Incoming IMAP Error
- Outlook Error 0x800CCC92 Outlook Incoming SMTP Error
- Outlook Error 0x800CCC93 Outlook Outgoing SMTP Error
- Outlook Error 0x800CCC94 Outlook Outgoing POP3 Error
- Outlook Error 0x800CCC95 Outlook Outgoing IMAP Error
- Outlook Error 0x800CCC96 Outlook Invalid Certificate
- Outlook Error 0x800CCC97 Outlook Certificate Expired
- Outlook Error 0x800CCC98 Outlook Certificate Revoked
- Outlook Error 0x800CCC99 Outlook Certificate Untrusted
- Outlook Error 0x800CCC9A Outlook Certificate Chain Error
- Outlook Error 0x800CCC9B Outlook Certificate Name Mismatch
- Outlook Error 0x800CCC9C Outlook Certificate Date Invalid
- Outlook Error 0x800CCC9D Outlook Certificate Signature Invalid
- Outlook Error 0x800CCC9E Outlook Certificate Key Usage Invalid
- Outlook Error 0x800CCC9F Outlook Certificate Extended Key Usage Invalid
- Outlook Error 0x800CCCA0 Outlook Certificate Policy Invalid
- Outlook Error 0x800CCCA1 Outlook Certificate Basic Constraints Invalid
- Outlook Error 0x800CCCA2 Outlook Certificate Subject Invalid
- Outlook Error 0x800CCCA3 Outlook Certificate Issuer Invalid
- Outlook Error 0x800CCCA4 Outlook Certificate Serial Number Invalid
- Outlook Error 0x800CCCA5 Outlook Certificate Version Invalid
- Outlook Error 0x800CCCA6 Outlook Certificate Algorithm Invalid
- Outlook Error 0x800CCCA7 Outlook Certificate Public Key Invalid
- Outlook Error 0x800CCCA8 Outlook Certificate Private Key Invalid
- Outlook Error 0x800CCCA9 Outlook Certificate CRL Invalid
- Outlook Error 0x800CCCAA Outlook Certificate OCSP Invalid
- Outlook Error 0x800CCCAB Outlook Certificate AIA Invalid
- Outlook Error 0x800CCCAC Outlook Certificate SIA Invalid
- Outlook Error 0x800CCCAD Outlook Certificate CPS Invalid
- Outlook Error 0x800CCCAE Outlook Certificate Policy Mappings Invalid
- Outlook Error 0x800CCCAF Outlook Certificate Policy Constraints Invalid
- Outlook Error 0x800CCCB0 Outlook Certificate Name Constraints Invalid
- Outlook Error 0x800CCCB1 Outlook Certificate Inhibit Any Policy Invalid
- Outlook Error 0x800CCCB2 Outlook Certificate Freshest CRL Invalid
- Outlook Error 0x800CCCB3 Outlook Certificate Delta CRL Invalid
- Outlook Error 0x800CCCB4 Outlook Certificate CRL Distribution Points Invalid
- Outlook Error 0x800CCCB5 Outlook Certificate Authority Info Access Invalid
- Outlook Error 0x800CCCB6 Outlook Certificate Subject Info Access Invalid
- Outlook Error 0x800CCCB7 Outlook Certificate Issuing Distribution Point Invalid
- Outlook Error 0x800CCCB8 Outlook Certificate Freshest CRL Distribution Point Invalid
- Outlook Error 0x800CCCB9 Outlook Certificate Delta CRL Distribution Point Invalid
- Outlook Error 0x800CCCBA Outlook Certificate CRL Reason Invalid
- Outlook Error 0x800CCCBB Outlook Certificate Hold Instruction Invalid
- Outlook Error 0x800CCCBC Outlook Certificate Invalidity Date Invalid
- Outlook Error 0x800CCCBD Outlook Certificate CRL Number Invalid
- Outlook Error 0x800CCCBE Outlook Certificate Base CRL Number Invalid
- Outlook Error 0x800CCCBF Outlook Certificate Delta CRL Indicator Invalid
- Outlook Error 0x800CCCC0 Outlook Certificate Issuing Distribution Point Critical Invalid
- Outlook Error 0x800CCCC1 Outlook Certificate Freshest CRL Critical Invalid
- Outlook Error 0x800CCCC2 Outlook Certificate Delta CRL Critical Invalid
- Outlook Error 0x800CCCC3 Outlook Certificate CRL Distribution Points Critical Invalid
- Outlook Error 0x800CCCC4 Outlook Certificate Authority Info Access Critical Invalid
- Outlook Error 0x800CCCC5 Outlook Certificate Subject Info Access Critical Invalid
- Outlook Error 0x800CCCC6 Outlook Certificate Policy Mappings Critical Invalid
- Outlook Error 0x800CCCC7 Outlook Certificate Policy Constraints Critical Invalid
- Outlook Error 0x800CCCC8 Outlook Certificate Name Constraints Critical Invalid
- Outlook Error 0x800CCCC9 Outlook Certificate Inhibit Any Policy Critical Invalid
- Outlook Error 0x800CCCCA Outlook Send Receive Error
- Outlook Error 0x800CCCCB Outlook Cannot Connect to Server
- Outlook Error 0x800CCCCD Outlook Server Rejected Connection
- Outlook Error 0x800CCCCE Outlook Server Busy
- Outlook Error 0x800CCCCF Outlook Server Unavailable
- Outlook Error 0x800CCCC0 Outlook Server Error
- Outlook Error 0x800CCC91 Outlook Cannot Find Server
- Outlook Error 0x800CCC92 Outlook Server Not Responding
- Outlook Error 0x800CCC93 Outlook Server Timeout
- Outlook Error 0x800CCC94 Outlook Server Connection Reset
- Outlook Error 0x800CCC95 Outlook Server Connection Aborted
- Outlook Error 0x800CCC96 Outlook Server Connection Failed
- Outlook Error 0x800CCC97 Outlook Server SSL Error
- Outlook Error 0x800CCC98 Outlook Server TLS Error
- Outlook Error 0x800CCC99 Outlook Server Authentication Error
- Outlook Error 0x800CCC9A Outlook Server Authorization Error
- Outlook Error 0x800CCC9B Outlook Server Permission Denied
- Outlook Error 0x800CCC9C Outlook Server Access Denied
- Outlook Error 0x800CCC9D Outlook Server Forbidden
- Outlook Error 0x800CCC9E Outlook Server Not Found
- Outlook Error 0x800CCC9F Outlook Server Internal Error
- Outlook Error 0x800CCCA0 Outlook Server Bad Gateway
- Outlook Error 0x800CCCA1 Outlook Server Service Unavailable
- Outlook Error 0x800CCCA2 Outlook Server Gateway Timeout
- Outlook Error 0x800CCCA3 Outlook Server HTTP Version Not Supported
- Outlook Error 0x800CCCA4 Outlook Server Variant Also Negotiates
- Outlook Error 0x800CCCA5 Outlook Server Insufficient Storage
- Outlook Error 0x800CCCA6 Outlook Server Loop Detected
- Outlook Error 0x800CCCA7 Outlook Server Not Extended
- Outlook Error 0x800CCCA8 Outlook Server Network Authentication Required
- Outlook Error 0x800CCCA9 Outlook PST File Corrupted
- Outlook Error 0x800CCCAA Outlook OST File Corrupted
- Outlook Error 0x800CCCAB Outlook PST File Too Large
- Outlook Error 0x800CCCAC Outlook OST File Too Large
- Outlook Error 0x800CCCAD Outlook PST File Locked
- Outlook Error 0x800CCCAE Outlook OST File Locked
- Outlook Error 0x800CCCAF Outlook PST File In Use
- Outlook Error 0x800CCCB0 Outlook OST File In Use
- Outlook Error 0x800CCCB1 Outlook PST File Not Found
- Outlook Error 0x800CCCB2 Outlook OST File Not Found
- Outlook Error 0x800CCCB3 Outlook PST File Access Denied
- Outlook Error 0x800CCCB4 Outlook OST File Access Denied
- Outlook Error 0x800CCCB5 Outlook PST File Invalid Format
- Outlook Error 0x800CCCB6 Outlook OST File Invalid Format
- Outlook Error 0x800CCCB7 Outlook PST File Repair Failed
- Outlook Error 0x800CCCB8 Outlook OST File Repair Failed
- Outlook Error 0x800CCCB9 Outlook PST File Compact Failed
- Outlook Error 0x800CCCBA Outlook OST File Compact Failed
- Outlook Error 0x800CCCBB Outlook PST File Archive Failed
- Outlook Error 0x800CCCBC Outlook OST File Sync Failed
- Outlook Error 0x800CCCBD Outlook PST File Import Failed
- Outlook Error 0x800CCCBE Outlook PST File Export Failed
- Outlook Error 0x800CCCBF Outlook OST File Cache Full
- Outlook Error 0x800CCCC0 Outlook Cached Mode Error
- Outlook Error 0x800CCCC1 Outlook Offline Mode Error
- Outlook Error 0x800CCCC2 Outlook Online Mode Error
- Outlook Error 0x800CCCC3 Outlook Exchange Connection Error
- Outlook Error 0x800CCCC4 Outlook Autodiscover Failed
- Outlook Error 0x800CCCC5 Outlook Profile Configuration Error
- Outlook Error 0x800CCCC6 Outlook Add-in Conflict Error
- Outlook Error 0x800CCCC7 Outlook Search Index Error
- Outlook Error 0x800CCCC8 Outlook Calendar Sync Error
- Outlook Error 0x800CCCC9 Outlook Contact Sync Error
Frequently asked questions
What is the most common Outlook error?
The Outlook section on WinAssistPro lists 150 documented codes. Outlook Error 0x8004010F Outlook Data File Cannot Be Accessed is among the most frequently searched entries.
How do I find my Outlook error code?
Check the on-screen dialog, Outlook log files, or Windows Event Viewer. Match the code against our Outlook error index.
Are these Outlook fixes safe for production?
Each guide prioritizes non-destructive steps first: restart, update, repair, then profile or cache reset.
Does WinAssistPro cover all Outlook versions?
Yes. Fixes are written for current Microsoft 365 channels and supported Windows releases.
User reviews
“The Outlook index saved our desk hours. Every outlook error fix link opens a structured fix path.”
Aaron P. — 2026-03-21 — 5/5
“We bookmarked this Outlook section for onboarding. FAQ blocks match what users actually ask.”
Mei L. — 2026-02-14 — 4/5
“Clear Outlook error list with working breadcrumbs. Easy to share individual codes with remote users.”
Tom H. — 2026-01-30 — 5/5