Fix automatic email syncing in Windows 10 Pro

When the Windows 10 Pro Mail app stops checking for new messages, the problem is often a background setting rather than a broken mailbox. An account may still send and receive mail when opened manually, while automatic delivery quietly remains disabled. A weak connection, outdated account password, or damaged app data can produce the same symptom.

The Mail and Calendar apps supplied with Windows 10 are also reaching the end of their useful life. Microsoft retired support for the original Mail app on 31 December 2024 and has been directing users towards the new Outlook for Windows. That means a repair may restore syncing temporarily, but moving to Outlook can be the more dependable long-term solution.

Before changing account settings, check whether the issue affects one address or every account in the app. A Gmail, Outlook.com, iCloud, or Australian ISP mailbox can each have different security and server requirements. Work through the simpler checks first, then repair the app if messages still arrive only after you open it.

Check the account and internet connection

Start by opening Mail and selecting the affected account. Look for an error banner, a warning icon, or a request to enter the password again. If the password was recently changed in a web browser, Windows 10 may continue using the old saved credential and stop background synchronisation. Sign in to the provider’s website first to confirm the mailbox itself works.

Test the connection in Microsoft Edge by loading several sites. An NBN connection can remain connected while DNS or Wi-Fi problems prevent a mail server from responding. This is particularly common after a modem restart or when a laptop moves between home Wi-Fi, a phone hotspot, and a workplace network. If you are using a Telstra, Optus, or another provider’s connection, briefly test the account on mobile data to separate a network fault from an app fault.

Check the Windows clock as well. Select the time in the taskbar, open Date and time settings, and enable automatic time and time zone options. Incorrect time can interfere with secure connections to mail servers. This can be noticeable when travelling between Australian states or after a computer has been unused for several weeks.

Turn on automatic synchronisation

In Mail, select the Settings gear, choose Manage accounts, and select the mailbox that is not updating. Open Change mailbox sync settings. Under the download options, set Download new content to as items arrive or to a suitable interval such as every 15 minutes. Also check that the email option is enabled under the content synchronisation settings.

Some accounts include a separate setting for how far back messages should be downloaded. Choosing a short period does not usually stop new messages arriving, but it can make the mailbox appear incomplete. Select a longer period if older messages are missing from the Windows 10 Pro Mail app.

Windows can restrict background activity to preserve battery power. Open Settings > Privacy > Background apps and allow Mail to run in the background if that option is available on your build. On a notebook, select Settings > System > Battery and review battery saver settings. Battery saver may pause background mail checks until the device is connected to power, which can explain why messages arrive after opening the app.

Review server and security settings

If automatic delivery fails for a Gmail or other third-party account, the account may need renewed permission. Open the provider’s security page in a browser and review recent sign-ins, blocked attempts, and app access. Google accounts can require an app password when two-step verification is enabled and the mail client does not support the newer sign-in method correctly. Follow the provider’s official instructions rather than disabling security features.

For accounts supplied by an internet provider, confirm the incoming server, outgoing server, port numbers, and encryption method. These details vary between providers, so use the provider’s current support page. Avoid copying settings from an old forum post. Australian ISPs sometimes change authentication requirements, especially when older mail platforms are retired or migrated.

A full inbox can also prevent new messages from arriving. Sign in through webmail and remove large attachments, empty deleted items, and check the junk folder. If the account works in webmail but fails in Mail, the issue is probably local. If it fails everywhere, contact the email provider before removing the account from Windows.

Use quick checks before repairing the app

A few small checks can identify whether syncing is paused, blocked, or simply delayed. Run them in order and try sending a test message from another address after each relevant change.

Start with these checks:

Then check these common blockers:

Security software can occasionally inspect encrypted mail traffic and delay background checks. Do not permanently disable antivirus protection, but consult its mail-scanning settings or test briefly with the feature paused. If the issue disappears, update the security program or ask its vendor for a safer configuration.

Storage pressure can affect app updates, temporary files, and background tasks. Windows10Pro.net’s storage optimisation guide explains how to free space safely on an SSD without deleting personal mail or documents.

Repair or reset Windows Mail

If the account settings look correct, repair the application through Windows. Open Settings > Apps > Apps & features, select Mail and Calendar, choose Advanced options, and press Repair. This process checks the app without normally removing account information. Open Mail afterwards and allow time for the folders to refresh.

If repair changes nothing, return to the same screen and choose Reset. Resetting clears the application’s local data, so you may need to add the email account again and download messages from the server. Messages stored online should remain in the mailbox, but confirm that important mail is visible in webmail before resetting.

You can also update built-in apps through the Microsoft Store. Open the Store, select Library, and choose Get updates. Install available Mail and Calendar or Outlook updates, then restart Windows. If the Store itself is not working, run Settings > Update & Security > Troubleshoot > Additional troubleshooters where available, or repair the Store using Microsoft’s current guidance.

Do not repeatedly remove and add an account if the provider has a sign-in lock or verification challenge. Multiple failed attempts may trigger additional security checks. Use webmail to approve the sign-in, then add the account once with the correct password and authentication method.

Move to Outlook when Mail is retired

Because Microsoft has retired the original Mail and Calendar application, persistent automatic-sync problems may be a sign that it is time to migrate. The new Outlook for Windows is designed to replace it and supports Microsoft accounts plus many third-party mail services. It can also provide a clearer sign-in flow when modern authentication is required.

Before switching, verify that every important message, contact, and calendar entry is stored on the server or exported according to the provider’s instructions. Accounts using IMAP generally keep messages online, but POP accounts may have downloaded mail that exists only on the computer. Do not uninstall the old app until you have checked webmail and confirmed that older local messages are preserved.

Select the Outlook option offered within Mail or install the current Microsoft-approved version through Windows or the Microsoft Store. Sign in, allow the initial synchronisation to finish, and compare folders with webmail. Large accounts may take time over a busy home connection, particularly when several people are streaming or working through an NBN service.

Windows 10 itself reached its scheduled end of support on 14 October 2025 for ordinary editions, so security and compatibility considerations matter as well. Organisations and eligible users may have separate extended-support arrangements, but home users should avoid relying on an unsupported operating system for daily email. Keep Windows protected, use a supported mail client, and maintain a separate backup of important correspondence.

Once syncing works, send a test message to the account and leave the computer idle for the chosen interval. Confirm that the notification appears without opening Mail. If only one provider continues to fail after the account has been checked in webmail, contact that provider with the exact error message, Windows version, and time of the failed attempt. If several accounts fail together, focus on Windows background permissions, network access, app updates, or migration to Outlook. Acting through those checks will restore reliable email alerts or identify when the legacy app should be replaced.