[
    {
        "role": "user",
        "content": "Outlook%20Classic%20has%20stopped%20getting%20my%20latest%20emails.%20I%20am%20signed%20into%20Gmail%20via%20the%20Outlook%20app%20but%20want%20to%20continue%20using%20the%20Outlook%20Classic%20app"
    },
    {
        "role": "assistant",
        "content": "Here\u2019s a step-by-step guide to get Classic Outlook working again with Gmail \u2014 including what changed recently, what Microsoft fixed, and what actions you should take now. If you run into any point you\u2019d like more detail on, I can help with that too.\n\n---\n\n## What changed / what issue was happening\n\n1. **OAuth & Permission Changes**  \n   In early 2026, many users found Gmail in Classic Outlook stopped syncing. Microsoft and Google updated how Gmail accounts authorize Outlook, especially around OAuth permissions. Classic Outlook wasn\u2019t always getting full access permission during the sign-in flow. ([probablypwned.com](https://www.probablypwned.com/article/microsoft-fixes-classic-outlook-gmail-sync-bug-oauth?utm_source=openai))\n\n2. **Specific bug / broken builds**  \n   A bug introduced around February 26, 2026 caused Gmail (and Yahoo) accounts in Classic Outlook to fail sync operations \u2014 errors like 0x800CCC0E, 0x800CCC0F showed up, new messages didn\u2019t come in, etc. ([probablypwned.com](https://www.probablypwned.com/article/microsoft-fixes-classic-outlook-gmail-sync-bug-oauth?utm_source=openai))\n\n3. **Fixes deployed**  \n   Microsoft released fixes starting in mid-March 2026. Key fixes include: updated sign-in flow (in a browser window); proper request for Gmail permissions during consent; and a \u201cRetry\u201d option for reauthenticating existing accounts. ([windowsreport.com](https://windowsreport.com/microsoft-fixes-gmail-sync-problems-in-classic-outlook-app/?utm_source=openai))\n\n4. **Required minimum Outlook versions**  \n   The fix for Gmail permissions in Classic Outlook requires being on builds at or above **Version 2412 Build 18324.20168**. Earlier builds may still have broken functionality. ([learn.microsoft.com](https://learn.microsoft.com/en-au/answers/questions/5823782/outlook-365-not-syncing-with-gmail?utm_source=openai))\n\n---\n\n## What you need to do to restore Gmail sync in Classic Outlook\n\nHere are detailed steps to try, in the order you should do them. Follow each fully before moving to the next.\n\n1. **Check your Outlook version / update if needed**  \n   - Open Outlook, go to **File \u2192 Office Account \u2192 About Outlook**, and note the version/build.  \n   - If it\u2019s *before* Current Channel Version 2412 Build 18324.20168 (or whatever Microsoft lists as the \u201cfixed build\u201d for your channel), go to **File \u2192 Office Account \u2192 Update Options \u2192 Update Now**.  \n   - After updating, restart Outlook. ([learn.microsoft.com](https://learn.microsoft.com/en-au/answers/questions/5823782/outlook-365-not-syncing-with-gmail?utm_source=openai))\n\n2. **Sign in via browser and grant full Gmail permissions**  \n   - In Outlook, try triggering the error (for example via Send/Receive) \u2014 often you'll see a \u201cRetry\u201d prompt or requirement to re-authenticate. ([support.microsoft.com](https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f?utm_source=openai))  \n   - When Outlook sends you to a browser for Gmail login, *make sure* you select/allow: **\u201cRead, compose, send, and permanently delete all your email from Gmail\u201d** when Google asks which permissions to grant. If you don\u2019t check that, syncing will be limited or blocked. ([support.microsoft.com](https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f?utm_source=openai))\n\n3. **Enable IMAP in Gmail settings**  \n   - Log into your Gmail via web \u2192 Settings \u2192 *See All Settings* \u2192 *Forwarding and POP/IMAP* \u2192 ensure **IMAP Access is enabled**. Without IMAP, Outlook can\u2019t fully synchronize. ([nerdtechy.com](https://nerdtechy.com/gmail-not-syncing-with-outlook?utm_source=openai))\n\n4. **Clear old credentials / Windows Credentials**  \n   - Open *Windows Credential Manager* and delete credentials that begin with `MicrosoftOffice16_Data:OAUTH2` (or similar) for your Gmail account. These might be stale or invalid. ([reddit.com](https://www.reddit.com/r/Outlook/comments/1rv1n1w/gmail_stopped_working_on_outlook_classic_from/?utm_source=openai))  \n   - Close Outlook, restart system. This forces Outlook to get fresh tokens. ([windowsreport.com](https://windowsreport.com/microsoft-fixes-gmail-sync-problems-in-classic-outlook-app/?utm_source=openai))\n\n5. **Re-add Gmail account if needed**  \n   - If reauthenticating doesn\u2019t work, remove the Gmail account in Outlook, then add it again. Follow the browser-sign-in flow carefully, granting necessary permission. ([support.microsoft.com](https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f?utm_source=openai))\n\n6. **Check label/folder sync settings**  \n   - In Gmail web settings \u2192 Labels: ensure any labels (folders) you want to see in Outlook are set to **\u201cShow in IMAP\u201d**. If not, those won\u2019t sync. ([nerdtechy.com](https://nerdtechy.com/gmail-not-syncing-with-outlook?utm_source=openai))\n\n7. **Two-factor authentication (2FA) / App Passwords** *(if applicable)*  \n   - If you've turned on 2FA in your Google Account, sometimes you\u2019ll need to generate an App Password for Outlook. However \u2014 recent fixes from Microsoft/Gmail may have improved OAuth support so that you can log in normally without an app-specific password. But if nothing works, trying an app password is still a good fallback. ([nerdtechy.com](https://nerdtechy.com/gmail-not-syncing-with-outlook?utm_source=openai))\n\n---\n\n## Quick checklist summary\n\n- Outlook build \u2265 2412 Build 18324.20168  \n- In Gmail consent screen: full email access allowed  \n- IMAP enabled in Gmail settings  \n- Old credentials cleaned out  \n- Account removed & re-added if necessary  \n- Labels set for IMAP  \n- (Optional): app password if 2FA is enabled and OAuth still fails\n\n---\n\nIf you tell me which version/build of Outlook Classic you're on (you can get that from **File \u2192 Office Account \u2192 About Outlook**), I can double-check if your build has the fix. Then I can walk you step-by-step for your version. Want to try that?"
    }
]