How to Fix Outlook Inbox Not Updating Automatically

Here is a categorized list of possible causes for the error ‘Outlook inbox not updating’ and how each can affect the way Outlook syncs mail.

1. Network or Service Issues: A slow, unstable, or interrupted internet connection can prevent Outlook from reaching the mail server and downloading new messages. Microsoft 365 service incidents or scheduled maintenance can also delay new mail from appearing, even when your own connection is fine. A firewall blocking Outlook’s connection to the server produces the same symptom. This can cause Outlook to stop syncing emails until the connection or service issue clears.
2. Account, Licensing, or Authentication Issues: If Outlook is not connecting to the Exchange server, an expired license, a sign-in prompt, or an Autodiscover misconfiguration can prevent the inbox from updating. Worth checking before assuming manually-entered server settings are wrong, since most modern Microsoft 365 and Exchange accounts configure themselves automatically.
3. Profile or Cache Issues: A corrupted or misconfigured Outlook profile, or a damaged local cache file, can stop the inbox from updating even though the mailbox on the server is current. You can try creating a new Outlook profile or rebuilding the OST file in Outlook — though a failed attempt on its own doesn’t confirm the OST is damaged, since service incidents, licensing issues, add-ins, and client bugs can produce the same symptom.
4. Conflicting Add-ins or Programs: Conflicts with other programs or add-ins can cause the error message. Antivirus software, backup software, or third-party add-ins may interfere with Outlook and make the data file temporarily inaccessible.
5. Data File Issues: If the Outlook data file has been moved, deleted, or made inaccessible, Outlook usually shows a startup or access error rather than a quietly stale inbox with no error at all. An Outlook version upgrade or downgrade can occasionally break the local cache format; when that happens, rebuilding the cache from the healthy server mailbox is the fix, rather than treating it as a general compatibility problem.

Is this a server issue or a client issue?

Before trying any fix, compare what you see in webmail against what you see in classic Outlook. This quick comparison tells you which category of fix to try first.

1. How to resolve the ‘Outlook not updating inbox error’?

   • Method 1: Check Work Offline status, connection, and service health

     Microsoft recommends checking these three things first whenever new mail stops arriving in classic Outlook, before assuming anything is wrong with the data file itself.

     • Step 1: Check if Outlook is set to Work Offline
       • Open the ‘Send / Receive’ tab in the ribbon and check whether ‘Work Offline’ is highlighted.
       • If it is, click it to reconnect, then confirm the status bar shows ‘Connected to: Microsoft Exchange’.
     • Step 2: Check your internet connection
       • Open a web browser and try to load a website; if that fails too, your connection itself may be down or unstable.
       • Run an online speed test if the connection seems slow rather than fully down, since a slow connection can also delay Outlook from downloading new mail.
       • If other programs on your computer can reach the internet without issue, the problem is more likely specific to Outlook’s connection to the mail server.
       • If your computer’s clock is set incorrectly, it can also interfere with mailbox syncing — check the time and date settings if the checks above come back clean.
     • Step 3: Check Microsoft 365 service health and licensing
       • If you’re on a Microsoft 365 business account, ask your admin to check the Microsoft 365 admin center service health dashboard for any ongoing Exchange Online incidents.
       • Confirm your mailbox license is active — an expired or unassigned license can silently stop mail delivery.
   • Method 2: Run a manual folder update

     In classic Outlook, go to the ‘Send / Receive’ tab and click ‘Update Folder’ on the folder that seems stale. This tells you whether the automatic background sync is the only thing failing, or whether there’s a deeper connectivity problem.

     • If the manual update succeeds and new mail appears, the issue is with automatic/background sync timing rather than connectivity — revisit the checks in Method 1 above.
     • If the manual update fails with an error, note the exact error code or message rather than repeating Send/Receive — that error is what actually points to the cause, whether it’s server-side or client-side.

     If a manual folder update returns error 0x80004005, this matches a known Microsoft 365 server-side folder-sync issue that Microsoft has already rolled out a fix for on updated server builds. It’s a useful example of why a stale inbox isn’t always caused by OST corruption — and it isn’t something an OST recovery tool can fix on its own.

   • Method 3: Restart Microsoft Outlook

     Restarting Outlook is a common method to solve most of the Outlook inbox and email synchronization problems.

     • Step 1: Close Microsoft Outlook and related processes
       • Click the ‘X’ in the top-right corner of the program window or select the ‘File’ menu and click ‘Exit.’
       • Give Outlook a few minutes to fully close down and release any resources that it was using.
       • Restart Outlook
     • Step 2: Check for Outlook updates
       • After Outlook has restarted, check to see if there are any updates available.
       • Go to the ‘File’ menu and select ‘Office Account’ or ‘Account,’ depending on your version of Outlook.
       • From there, you can check for updates and install any that are available.

     After you have checked for updates, try accessing your inbox again to see if Outlook can synchronize and update emails with the server. If it cannot update the inbox and shared folders automatically, you may need to try the next method to resolve the issue.

   • Method 4: Clear Outlook Cache

     Clearing the Outlook cache can help fix problems related to syncing emails and other mailbox data. Over time, cache files may become corrupted, which can interfere with Outlook’s ability to sync properly. Removing these files allows Outlook to create fresh, error-free cache data, which often resolves the synchronization issue.

     • Step 1: Close Microsoft Outlook
       • Before you can clear the Outlook cache, you need to make sure that Microsoft Outlook is closed.
     • Step 2: Navigate to the Outlook Cache Folder
       • Open the Run dialog box: Press the Windows key + R on your keyboard to open the Run dialog box.
       • Type ‘%localappdata%\Microsoft\Outlook’ and click ‘OK’, which opens the folder where the Outlook cache files are stored.
     • Step 3: Delete the contents of the RoamCache folder
       • Open the RoamCache folder
       • Select all the files in the folder and then press the Delete key on your keyboard.
       • After you have deleted the contents, close the folder.
     • Step 4: Restart Microsoft Outlook
       • Now that you have cleared the Outlook cache, you can open Microsoft Outlook again.
       • When you open Outlook, it creates new cache files, which should help to resolve any issues you were experiencing with your inbox not updating.
   • Method 5: Disable incompatible Outlook Add-ins

     While accessing Outlook, you may encounter a message ‘Outlook detected a COM add-in problem’. These COM add-ins decrease performance or cause Outlook to crash. In such cases, disabling or removing the incompatible add-ins from Outlook can help resolve mail synchronization and email not updating problems.

     • Step 1: Close and relaunch Microsoft Outlook in Safe mode
       • You can do this by clicking on the ‘X’ in the top-right corner of the program window or by going to the File menu and selecting ‘Exit’
       • To open Outlook in safe mode, hold down the CTRL key while clicking on the Outlook icon, which launches Outlook in safe mode with all add-ins disabled.
     • Step 2: Check if the issue has been resolved
       • After you launch Outlook in safe mode, try accessing your inbox again to see if the issue has been resolved.
       • If the error ‘Outlook not updating inbox automatically is resolved’, then it is likely that one or more of your add-ins is causing the issue.
     • Step 3: Disable the Outlook add-ins one at a time
       • To disable add-ins, go to the File menu and select ‘Options.’
       • From there, select ‘Add-ins’ and then click on the ‘Go’ button next to ‘Manage COM Add-ins’, which brings up a list of all of the add-ins that are currently installed in Outlook.
       • To identify which add-in is causing the issue, disable one add-in at a time and then try accessing your inbox again.
       • If the issue is resolved, then the add-in that you just disabled is likely causing the issue.

         

     • Step 4: Remove or update incompatible Add-ins
       • Once you have identified the add-in that is causing the issue, you can either remove it from Outlook or update it to a compatible version.
       • Finally, restart Outlook to check if the issue has been resolved.
   • Method 6: Check and reconfigure Outlook account settings

     If the checks above haven’t resolved the issue, it’s worth reviewing your Outlook account settings — though on modern Microsoft 365 and Exchange accounts these are normally configured automatically through Autodiscover, so this step is more likely to help if you’re on a POP or IMAP account, or if the settings were changed manually.

     • Step 1: Check email account settings in Outlook
       • Open Outlook and go to the ‘File’ menu.
       • From there, select ‘Account Settings’ and then ‘Account Settings’ again.
       • This brings up a list of all of the email accounts that you have set up in Outlook.

         

     • Step 2: Check the server settings for your email account
       • Double-click on the email account that you are having issues with to bring up its settings.
       • From there, check the incoming and outgoing server settings to make sure that they are correct.
       • This step helps you to identify any issues with the settings that could be preventing Outlook from properly syncing with your mailbox.
     • Step 3: Reconfigure your email account settings
       • If there are any issues with your email account settings, you can reconfigure them by clicking on the ‘Change’ button and then following the prompts to update your settings.
       • Restart Outlook and check if the issue has been resolved
     • Step 4: Check the Cached Exchange mode settings

       Check your Cached Exchange mode settings to ensure that they are properly configured. Cached Exchange mode in Outlook can help to improve performance by storing a copy of your mailbox on your local computer. However, if the settings are not configured correctly, it can cause issues with syncing your mailbox.

       • You can access the Cached Exchange mode settings by going to ‘File > Account Settings > Account Settings’, and then selecting your Exchange account and clicking ‘Change’.

         

         After you restart Outlook, try accessing your inbox again to see if the issue has been resolved. If the application is unable to open the Outlook data file, you may need to try the next method to resolve the issue.

   • Method 7: Rebuild the OST file if your server mailbox is healthy

     If the decision table above points to a client-side/cache issue and you’ve confirmed the server mailbox itself is complete and up to date (for example, by comparing against Outlook on the web), the safest fix is usually to let Outlook rebuild a fresh local cache rather than trying to convert the old one.

     • Close Outlook, then rebuild the OST file in Outlook — this creates a new, empty cache file that Outlook repopulates directly from the server mailbox.
     • Because the new cache downloads straight from the server, this only works when the server-side mailbox is the complete, authoritative copy of your data.

     If you or someone else worked offline for a period, or you’re not certain the server mailbox is complete, keep a copy of the old OST file before deleting or rebuilding it — that copy is the only way to recover any locally-held data the server doesn’t have, and it’s much harder to get back once the cache has been rebuilt.

   • Method 8: Recover data from an inaccessible or orphaned OST file

     EdbMails is the right tool here once you’ve confirmed this is genuinely an OST problem — for example, the Outlook data file cannot be accessed at all, or it’s become disconnected or orphaned from its original mailbox — rather than as a general fix for a live inbox that simply hasn’t refreshed yet.

     To recover data from a damaged, disconnected, or orphaned OST file, use the OST to PST Converter:

     • EdbMails can scan and preview the contents of the OST file on its own, without Outlook installed. Outlook is only needed afterward if you want to import the exported PST back into a local Outlook profile — for migrating the recovered data directly into Microsoft 365 or a live Exchange mailbox, Outlook isn’t required at all.
     • Select the damaged or orphaned OST file, let the tool scan it, preview the recovered mail items, then export them to PST or migrate them directly.

      For the full step-by-step walkthrough with screenshots, see our OST to PST Converter guide.

     Keep in mind that exporting the OST to PST gives you local access to the recovered data — it does not, on its own, fix the underlying Microsoft 365 or Exchange synchronization problem that made the mailbox stop updating in the first place. If the live sync issue is still unresolved, work through the connection, service, and profile checks above as well.