When you open Outlook, you hope to see your most recent Gmail messages; the inbox appears exactly as it did hours before.
When you access Gmail directly, you find that new emails are reaching it normally, but Outlook displays an old inbox. This is exactly where you are experiencing the problem of Gmail and Outlook not syncing.
In many instances, the problem is due to account authentication, the synchronization settings, Gmail permissions, an outdated version of Outlook, or a connection problem between Google and Microsoft.
There are a number of practical methods available for diagnosing and correcting the issue.
Gmail and Outlook Not Syncing: Why It Happens
When adding Gmail to Outlook, the program will need to be given permission in order to communicate with your Google account and to get your messages.
Even if the connection fails, Outlook might cease to download new emails even though Gmail continues to function normally.
There are some common reasons, including:
- Problems with Google account authentication
- Incorrect or outdated Outlook settings
- Gmail connection or IMAP configuration issues
- Outlook being offline
- A damaged Outlook profile
- Expired authentication credentials
- Outdated Microsoft 365 software
- Temporary synchronization problems
It is recommended by Google that you use Sign in with Google when linking your Gmail account to another email client instead of providing your usual Google username and password.
1. Check Gmail Directly First
Before making any changes in Outlook, open Gmail in your web browser. Send a test email from a different account and see whether it appears in Gmail.
If the email shows up in your Gmail account but not in Outlook, then it is your Gmail account that is receiving the message. The issue is most probably due to the connection or the synchronization between Gmail and Outlook.
This simple test will prevent you from altering settings that aren’t really causing the problem.
2. Make sure Outlook isn’t in Work Offline mode
When you are using the classic Outlook on Windows, ensure that it is not in Work Offline mode. If Outlook is working offline, it is unable to communicate properly with the mail server in order to download new messages.
It is recommended by Microsoft that you check the Work Offline setting when classic Outlook is not syncing an email account.
What you could do is turn off the Work Offline option and then use Send/Receive to look for any new messages.
- Open Outlook and click the Send/Receive tab.
- Look at the Work Offline button. If it’s highlighted, Outlook is offline. Click it once to turn it off.
- Press F9 to run Send/Receive and check for new mail.
3. Verify Your Google Account Connection
An important step when you are having Outlook sync issues with Gmail is to verify that Google still permits Outlook to access the account.
The way to proceed when Gmail is incorporated into a current version of Outlook is to use Google’s sign-in procedure.
When setting things up, Google will ask you to give Microsoft permission to access your Gmail account; Outlook might not be able to synchronize your messages properly if the necessary permission has not been granted.
Microsoft clearly records instances in which Gmail synchronization fails because the necessary permissions for the Microsoft apps and services were not chosen when signing in to Google.
4. Check the Gmail and IMAP settings
In certain instances involving Gmail and Outlook, the IMAP settings may have an effect on the synchronization.
The present troubleshooting advice from Microsoft states that in order to connect a Gmail account, that Gmail account must have the necessary IMAP access and folder visibility.
There is, nevertheless, an important update. Google states that for personal Google accounts, the possibility of manually enabling or disabling IMAP will no longer be available starting in January 2025 since IMAP access will always be enabled; current connections will be unaffected.
Therefore, if you are using an old tutorial that tells you to simply tick the Enable IMAP option in each Gmail account.
One thing you can still check is label visibility. In Gmail, go to Settings > See all settings > Labels and make sure the labels you want in Outlook are ticked under Show in IMAP.
5. Update Microsoft Outlook
Using an old version of Outlook may result in compatibility and authentication problems.
Microsoft has already recorded the problems associated with connecting to Gmail in the classic version of Outlook, and these issues have been resolved as a result of updates to Microsoft 365.
Before carrying out any complicated troubleshooting steps, please make sure that both Microsoft 365 and Outlook are fully updated.Go to File > Office Account > Update Options > Update Now, then restart Outlook.
6. Outlook not receiving emails from Gmail? Check these folders
Sometimes the problem is more specific: Outlook is not getting emails from Gmail, but all the other messages are showing up as normal. In this case, verify if the Gmail messages are being moved somewhere else.
Look at: Junk Email, Other/Focused Inbox, Deleted Items, Archive, Custom folders, Outlook rules
Make sure that the sender hasn’t been blocked as well. The issue could be due to filtering rather than synchronization if only messages from one Gmail address are missing.
File > Manage Rules & Alerts, and your blocked senders under Home > Junk > Junk E-mail Options > Blocked Senders.
7. Reconnect Your Gmail Account
If Gmail functions properly in your browser but Outlook still remains stuck, then reconnecting the account will help to refresh the authentication connection.
Before you delete an account, ensure that you know the right login details and understand if the account has any data stored locally.
- Go to File > Account Settings > Account Settings.
- Select your Gmail account and click Remove.
- Click New and enter your Gmail address.
- When Google’s sign-in window opens, choose Sign in with Google and allow the permissions it asks for.
What about app passwords?
An app password could still be relevant in certain cases, especially where the application does not support Google’s standard Sign in with Google procedure.
Google states that app passwords are only necessary when 2-Step Verification is in use and that they are not recommended in cases where Sign in with Google is available.
8. Outlook 365 Gmail sync issues: check for a known Microsoft problem
Microsoft recorded a problem in 2026 involving certain Gmail and Yahoo accounts which ceased to synchronise in classic Outlook from 26th February 2026, with users encountering errors coded as 0x800CCC0E and 0x800CCC0F. The company stated that the issue was resolved by means of a service update to Microsoft 365 on 20th March 2026.
It’s a good reminder that email sync problems can sometimes be due to the service rather than your computer.
9. Repair Your Outlook Profile
If Gmail functions perfectly when using the browser but Outlook still displays an old inbox, then your Outlook profile may need to be looked at.
For Microsoft, troubleshooting and profile-repair options are available in the case of classic Outlook when messages and folders are not synchronising correctly.
Try the repair first:
- Go to File > Account Settings > Account Settings.
- Select your Gmail account and click Repair.
- Follow the prompts, then restart Outlook.
However, before rebuilding the Outlook profile, it is advisable to determine if the problem lies with account authentication, synchronization, or the Outlook installation itself.
Conclusion: Fixing Gmail and Outlook Not Syncing
The problem is most often to be found somewhere in the connection between your Google account and Outlook when Gmail and Outlook are not syncing; it does not have to be with the emails themselves.
Start logging into Gmail through a web browser, then check Outlook’s connection, authentication, update process, and synchronization. If the problem appeared suddenly, it is also worth considering whether there is a known issue with a Microsoft service.
If you have tried all the standard methods without getting any results, then professional Outlook support can help you to find out the actual issue.
FAQ: Gmail and Outlook Not Syncing
1. Why isn’t Gmail syncing with Outlook?
It is generally due to a connection, an authentication, or an Outlook account problem. First of all, check if Gmail is working properly in your browser.
2. Why isn’t Outlook picking up emails from Gmail?
Make sure that the connection to Gmail is working, that the Outlook sync status is correct, and that the email filters are properly set up. If Gmail receives the email but Outlook does not, the problem is probably due to the Outlook connection or the synchronization process.
3. How can I correct the sync problems with Gmail and Outlook?
The first step is to update Outlook and then reconnect your Gmail account by selecting Sign in with Google. This is the method recommended by Google Support for connecting Gmail with email clients that are supported.
4. Why is my Gmail account not being synchronised with Outlook 365?
This may result from an authentication issue, an outdated version of Outlook, or a temporary problem with the Microsoft service. Simply updating Outlook and then reconnecting the account often resolves the issue.
5. Can the settings in Gmail affect synchronization with Outlook?
Yes, the connection may be affected by Gmail permissions and account settings; Google recommends using ‘Sign in with Google’ rather than providing your email client with your regular Google password.
6. Why does Gmail function while Outlook displays old emails?
Outlook might not be syncing properly if some of the new emails appear in Gmail but not in Outlook. You should check the connection and the account status in Outlook and then attempt to reconnect the Gmail account.
7. What should I do if Gmail and Outlook still won’t sync?
If basic troubleshooting doesn’t work, the Outlook account or profile may need further diagnosis. Professional Outlook support can help identify whether the problem is with Gmail, authentication, or Outlook itself.
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