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How To Fix When O365 Outlook Doesn’t Display All Gmail Emails

How to Setup Gmail in Outlook

Here is how to fix and when you are seeing emails in Gmail but they are missing emails in Outlook.

Whether you’re using Outlook for desktop or Outlook 365 with a Gmail account, it’s frustrating when messages seem to vanish from one platform but not the other. Don’t worry—this guide walks you through the exact steps to fix Outlook not displaying all emails.

Why Outlook Isn’t Showing All Gmail Emails

When you connect a Gmail account to Outlook using IMAP, the synchronization isn’t always perfect. A few common causes include:

  • Outlook’s “Mail to keep offline” setting is too short
  • Emails are filtered into different folders (like Archive or All Mail)
  • Gmail labels aren’t syncing as expected
  • The Outlook profile is incorrectly setup or corrupted
  • IMAP sync settings are misconfigured

Let’s fix it step-by-step.

How to Properly Set Up a Gmail Account in Outlook

Here is a step-by-step guide to properly connect your Gmail account to Outlook using IMAP, so your email stays synced across all devices.

Step 1: Enable IMAP in Gmail

IMAP allows Outlook to access and sync Gmail emails properly.

Steps:

  1. Log in to Gmail.com
  2. Click the gear icon (⚙️) > See all settings
  3. Go to the Forwarding and POP/IMAP tab
  4. Under “IMAP Access,” select Enable IMAP
  5. Click Save Changes

Step 2: Generate an App Password (If You Use 2-Step Verification)

If you have 2-factor authentication enabled on your Google account (which you likely do), you’ll need to create a special App Password for Outlook.

Steps:

  1. Go to Google Account Security Settings
  2. Create any name you want for the App Password
    ✂️ Copy this—this is what you’ll use in Outlook instead of your normal Gmail password

Step 3: Add Gmail to Outlook

How to Setup Gmail in Outlook

Now you’re ready to add your Gmail account to Outlook.

Outlook 365 / 2019 / 2016:

Steps:

  1. In Windows search and open Control Panel > Mail > Show Profiles
  2. Choose “Prompt for a profile to be used” or set the new one as default
  3. Click Add to create a new profile
  4. Name it Google and hit OK
  5. Enter your gmail email address
  6. When prompted for your password:
    • If you created an App Password (see Step 2), use that
    • Otherwise, enter your regular password if you don’t use 2FA
  7. Outlook will configure server settings automatically
  8. Click Done when it says “Account setup is complete”

✅ Your Gmail account should now appear in Outlook!

Advanced Manual Setup (Likely Not Needed)

If auto setup fails, you can add Gmail manually:

Manual IMAP Settings for Gmail:

  • Incoming Mail (IMAP):
    • Server: imap.gmail.com
    • Port: 993
    • Encryption: SSL/TLS
  • Outgoing Mail (SMTP):
    • Server: smtp.gmail.com
    • Port: 465 or 587
    • Encryption: SSL or STARTTLS
    • Requires authentication: ✅ Yes (same as incoming)

Make sure your Gmail username is your full email address (e.g., yourname@gmail.com).

Once your Gmail account is connected, a few Outlook-side settings determine whether everything actually syncs correctly.

Outlook Fix 1: Adjust Outlook’s “Mail to Keep Offline” Setting

Outlook only syncs emails from a certain time window by default.

Steps (Outlook Desktop):

  1. Open Outlook
  2. Go to File > Account Settings > Account Settings
  3. Double-click your Gmail account
  4. You’ll see a slider under “Mail to keep offline”
  5. Slide it to “All” to sync all emails
  6. Click Next > Done, then restart Outlook

📝 This setting controls how much email data Outlook keeps locally. Anything outside the selected range won’t appear unless you’re online or extend the range.

Outlook Fix 2: Check Gmail’s “All Mail” and Other Labels

Gmail uses labels instead of traditional folders. If Outlook is only syncing the “Inbox,” you’re missing a ton of emails.

Steps:

  1. Log in to Gmail.com
  2. On the left, click More > All Mail
  3. Look for emails missing from Outlook—if they’re here, it means:
    • Gmail labeled them but didn’t move them to Inbox
    • Outlook is not syncing the label

Outlook Fix 3: Enable Gmail Labels for IMAP

By default, Gmail may not allow all labels to sync to Outlook via IMAP.

Steps:

  1. Go to Gmail.com > Settings (gear icon) > See all settings
  2. Click the Labels tab
  3. Scroll down to System labels and Labels
  4. Check “Show in IMAP” for any folder you want synced (Inbox, All Mail, Sent, etc.)

✅ Make sure All Mail is checked if you want full access from Outlook.

Outlook Fix 4: Disable Conversation View (Optional)

Sometimes, Outlook groups emails by conversation, hiding individual messages.

To turn it off:

  1. In Outlook, go to the View tab
  2. Uncheck “Show as Conversations”

This may reveal emails that were hidden in threads.

Still Missing Emails in Outlook?

If you’ve tried everything and Outlook still isn’t syncing all Gmail emails:

  • Switch to Outlook on the web as a workaround
  • Try a full uninstall and reinstall of Office
  • Consider using Google Workspace Sync for Microsoft Outlook (GWSMO) if you’re on a business plan
Final Thoughts On How To Fix When Outlook Doesn’t Sync All Your Gmail Emails

If Gmail shows all your emails but Outlook doesn’t, it’s almost always a sync setting, a label issue, or offline mail limits. With the steps above, you can fix the issue and get Outlook fully synced with Gmail again.

Need help setting up Outlook and Gmail for a whole team? Cloud email configuration like this is exactly the kind of managed IT services and Business IT support we provide for Chicagoland companies.

Contact LME Services and We Will Fix This For You