Change Mail Sync Settings in Windows 10

To change mailbox sync settings in the Windows 10 Mail app, open the app, go to Settings (gear icon) > Manage Accounts, select your account, and choose “Change mailbox sync settings.” There you can adjust the sync frequency, download new content, and choose how long emails stay on your device.

Background: How the Mail App Syncs

The Windows 10 Mail app (part of the built-in “Mail and Calendar” suite) uses Exchange ActiveSync (EAS) or IMAP to connect to your email provider. Unlike a webmail interface, the app downloads copies of your messages to your device so you can read them offline. Sync settings control how often the app checks for new mail and how much of your mailbox it stores locally.

For most accounts (Outlook.com, Office 365, Gmail, Yahoo, iCloud), the default sync frequency is “As items arrive,” which uses push notifications when your provider supports it. If your provider doesn’t support push, the app falls back to a polling interval you can set (from 5 minutes to hourly). The “Download new content” option controls the time range of messages you want available offline (e.g., the last 7 days, the last month, or all mail).

Where to Find the Settings

The exact path varies slightly depending on your Windows 10 version, but it’s always under the gear icon in the bottom-left corner of the Mail app.

Open the Mail app.
Click the gear (Settings) icon in the bottom-left.
Select “Manage Accounts” in the right-hand pane.
Click on the account you want to change (e.g., “Outlook.com” or “Gmail”).
Click “Change mailbox sync settings.”

If you don’t see “Change mailbox sync settings,” it may be because your account is an Exchange or Office 365 account that syncs via EAS—in that case, the option might be labeled “Change mailbox sync settings” or simply “Sync options.” For some accounts (like a POP3 account), the Mail app doesn’t offer a sync frequency option; it downloads new messages on each manual refresh or at the app’s default interval.

What Each Setting Does

Once you’re in the sync settings for a specific account, you’ll see several options:

Sync options: A toggle to enable or disable syncing for that account. Turning it off stops all background sync, but you can still manually refresh by swiping down or pressing Ctrl+F5.
Download new content: A drop-down menu that lets you choose how far back you want to sync. Options typically include “Any time,” “Last 7 days,” “Last 2 weeks,” “Last month,” or “Last 3 months.” Choosing a shorter period reduces storage usage and speeds up initial sync.
Sync email: A toggle that turns email sync on/off independently of calendar and contacts.
Sync calendar and contacts: Separate toggles for calendar and contact sync (if your provider supports them).
Download new email: A drop-down for how often to check for new mail. Options: “As items arrive,” “Every 5 minutes,” “Every 15 minutes,” “Every 30 minutes,” “Hourly,” or “Manual.”

Note: The “Download new content” setting is about the initial sync and ongoing retention. If you set it to “Last month,” the app will only keep the last month of messages on your device, but you can still search and access older messages online if you have an internet connection (for Exchange/Outlook.com accounts). For IMAP accounts, the app might not support server-side search for older items.

How to Choose the Right Settings for Your Needs

There’s no one-size-fits-all answer—it depends on your storage, data plan, and how quickly you need new mail.

If you have a small SSD or limited storage: Set “Download new content” to “Last 7 days” or “Last 2 weeks.” This keeps the local database small.
If you travel and need offline access to old emails: Choose “Any time” (or the longest available range). Be aware this can take significant space—a busy inbox can be several gigabytes.
If you’re on a metered connection (mobile hotspot): Set “Download new email” to “Manual” or “Hourly” to avoid frequent background data usage. Also consider turning off “Sync calendar and contacts” if you don’t need them.
If you rely on instant notifications: Keep “As items arrive” selected. If your provider doesn’t support push, the app will poll at the interval you set—5 minutes is the most frequent.

A practical approach: start with “Last month” and “As items arrive.” If you notice the app is sluggish or storage fills up, reduce the time range. If you miss emails because they arrive late, check if your provider supports push (most modern ones do).

Common Problems and Fixes

Users often run into a few recurring issues when adjusting sync settings:

Changes don’t seem to stick: After changing settings, close and reopen the Mail app. Sometimes the app needs a restart to apply new sync intervals.
Emails not downloading: If you set “Download new email” to “Manual,” you must refresh manually. If you’re on “As items arrive” but not getting mail, check your internet connection and whether the account is set to “Sync options” = On.
Storage space still high: Even after reducing “Download new content,” the app may not immediately delete old emails. Try a manual sync (press Ctrl+F5) or restart the app. If that fails, you can remove the account and re-add it, which forces a fresh sync.
Calendar/contacts not syncing: Make sure the respective toggles are on. For some third-party providers (like Gmail), you must enable IMAP in your Gmail settings and allow “Less secure apps” if you’re not using OAuth (though Google has been phasing this out).
Sync frequency option missing: If you don’t see “Download new email,” your account might be a POP3 account. The Mail app doesn’t support POP3 (it only supports Exchange, IMAP, and Outlook.com). If you added a POP3 account via a workaround, you won’t get sync frequency controls.

If nothing works, a common fix is to remove the account and re-add it. This often resets sync state and clears any corrupted settings.

Comparison: Mail App vs. Other Clients

The Windows 10 Mail app is a lightweight client, but its sync options are more limited than dedicated desktop clients like Microsoft Outlook or Mozilla Thunderbird.

Outlook (desktop): Offers granular control over send/receive groups, offline folder settings, and sync filters. You can set different sync intervals for different folders.
Thunderbird: Lets you set per-account server settings, including check intervals and offline storage. It also supports global search across all synced mail.
Windows 10 Mail: Simpler, but lacks folder-level sync control. You can’t choose to sync only a specific folder—it syncs the entire mailbox (subject to the time range).

For most users, the built-in app is sufficient. But if you need to sync only certain folders or want more control over offline storage, a third-party client might be better.

Costs and Safety Considerations

The Mail app is free and built into Windows 10. There are no hidden costs, but be aware of data usage: syncing a large mailbox over a metered connection can consume significant data. To avoid surprises, you can set your connection as metered in Windows Settings, and the Mail app will respect that by not syncing as aggressively.

Security-wise, the Mail app stores your credentials in Windows Credential Manager. If you’re using a shared computer, make sure you log off when you’re done. Also, if you use two-factor authentication with your email provider, you may need to generate an app-specific password for the Mail app to work—this is common with Gmail and Outlook.com.

One misconception: changing sync settings does not delete emails from your server. It only affects what’s stored locally on your device. Your mailbox on the server remains intact.

Alternatives to the Built-in Mail App

If the Windows 10 Mail app doesn’t meet your needs, consider these alternatives:

Microsoft Outlook (Office 365 version): Full-featured, but requires a subscription or one-time purchase.
Mozilla Thunderbird: Free, open-source, and highly customizable.
Mailbird, eM Client, or Spike: Third-party clients with modern interfaces and extra features like unified inbox and snooze.
Webmail: Use your provider’s website (e.g., outlook.com, gmail.com) directly—no sync settings needed, but no offline access.

Each has its own sync settings, so if you switch, you’ll need to configure them accordingly.

Frequently Asked Questions

Why can’t I change the sync frequency for my Gmail account?

Gmail uses IMAP, and the Mail app supports IMAP, but the sync frequency option may be greyed out if the account was added as an Exchange account. To fix, remove the account and re-add it selecting “Google” or “IMAP” instead of “Exchange.” Also ensure IMAP is enabled in your Gmail settings.

Does changing sync settings delete my emails from the server?

No. Sync settings only affect what’s stored locally on your device. Your emails remain on the server. Even if you set “Download new content” to “Last 7 days,” older emails are still accessible if you have an internet connection (for Exchange/Outlook.com accounts).

How do I set the Mail app to sync only when I open it?

Set “Download new email” to “Manual.” Then the app will only check for new mail when you manually refresh (swipe down or press Ctrl+F5). This is useful for saving battery and data.

My calendar isn’t syncing after I changed settings. What should I do?

Check that the “Sync calendar and contacts” toggle is on for that account. If it’s already on, try toggling it off and on again, then restart the Mail app. If that doesn’t work, remove the account and re-add it.

Can I sync only specific folders (like Inbox) and not others?

No, the Windows 10 Mail app doesn’t support folder-level sync selection. It syncs all folders within the time range you set. If you need folder-level control, consider using a third-party client like Thunderbird.

Will changing sync settings affect my battery life?

Yes. More frequent sync (e.g., “As items arrive” or “Every 5 minutes”) uses more battery and data. If you’re concerned about battery, set a longer interval like “Hourly” or “Manual.”

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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