What causes windows mail app not syncing on Windows?

Common causes of windows mail app not syncing include: App password required for Gmail/Yahoo (2FA enabled), Account credentials expired or changed, Mail app cache corrupted, Privacy settings blocking Mail app internet access, Sync frequency set too low, Windows Firewall blocking Mail app.

How do I know if I have windows mail app not syncing issues?

Common symptoms of windows mail app not syncing include: Mail app says "Account is out of date" or "Attention needed", No new emails appearing despite sending test emails, Sync button spins but nothing downloads, Error 0x8000000b or 0x80048830 in Mail app, Gmail or Yahoo account won't connect, Calendar events not syncing with mail account.

Can RescuePC fix windows mail app not syncing automatically?

Yes, RescuePC Toolkit includes automated scripts that can diagnose and fix windows mail app not syncing issues with one click, without requiring technical knowledge.

Fix Windows Mail App Not Syncing on Windows

Symptoms

You might be experiencing this problem if you notice:

•Mail app says "Account is out of date" or "Attention needed"
•No new emails appearing despite sending test emails
•Sync button spins but nothing downloads
•Error 0x8000000b or 0x80048830 in Mail app
•Gmail or Yahoo account won't connect
•Calendar events not syncing with mail account

Common Causes

⚠App password required for Gmail/Yahoo (2FA enabled)
⚠Account credentials expired or changed
⚠Mail app cache corrupted
⚠Privacy settings blocking Mail app internet access
⚠Sync frequency set too low
⚠Windows Firewall blocking Mail app

Solutions

Solution 1: Remove and Re-add Email Account

1Open Mail app > Settings (gear icon) > Manage accounts
2Click the problematic account > "Delete account from this device"
3Close and reopen Mail app
4Click Settings > Manage accounts > Add account
5Select your email provider (Google, Outlook, Yahoo)
6Sign in with current credentials — allow all permissions requested

Solution 2: Fix Gmail and Yahoo Sync

1Gmail with 2FA: generate an App Password at myaccount.google.com
2Go to Security > App passwords > generate a password for "Mail"
3Use this 16-character app password instead of your regular password
4Yahoo: similar process at login.yahoo.com > Account Security > App password
5When adding account in Mail: choose "Other account" if auto-setup fails
6Enter IMAP settings manually if needed

Solution 3: Reset Mail App

1Go to Settings > Apps > Installed apps
2Find "Mail and Calendar"
3Click three dots > Advanced options
4Click "Repair" first
5If still broken: click "Reset"
6Note: Reset removes all accounts — you'll need to re-add them

FIXES THIS IN 5 MINUTES

Fix Windows Mail App Not Syncing Automatically

RescuePC Toolkit includes 109+ automated repairs that fix this problem with one click. No command line knowledge required.

Download Now - Free Trial

No credit card required • Works on Windows 10 & 11