In the space for the folder path and files a the message x Error appears before the folder/file list.
It says a sync error to outlook classic. The 2 arrows indicate that syncing is in process, but it has been like this for a few days. null

Question

In the space for the folder path and files a the message x Error appears before the folder/file list.
It says a sync error to outlook classic. The 2 arrows indicate that syncing is in process, but it has been like this for a few days. null

jwakers23 · Accepted Answer

It sounds like Outlook is stuck in a continuous sync state, which usually happens due to corrupted cache, connection issues, or a problem with the OST file. Here are some steps you can try to resolve it:

✅ 1. Restart Outlook and Your Device

Close Outlook completely (check Task Manager to ensure it’s not running in the background).
Restart your computer and reopen Outlook.

✅ 2. Check Internet Connection

Make sure you have a stable network connection. A weak or intermittent connection can cause sync delays.

✅ 3. Clear Offline Cache

In Outlook Classic:

Go to File > Account Settings > Account Settings.
Select your account and click Change.
Disable Use Cached Exchange Mode, restart Outlook, then re-enable it.
This refreshes the OST file.

✅ 4. Repair the OST File

Close Outlook.
Navigate to:
C:\Users\<YourUsername>\AppData\Local\Microsoft\Outlook
Find the .ost file and rename it (e.g., old.ost).
Restart Outlook; it will create a new OST file and resync.

✅ 5. Use Inbox Repair Tool

Run SCANPST.EXE (found in your Office installation folder).
Select your OST file and repair it.

✅ 6. Check Add-ins

Disable unnecessary add-ins:
File > Options > Add-ins > Manage COM Add-ins > Go
Uncheck any non-essential add-ins and restart Outlook.

✅ 7. Update Outlook

Ensure you have the latest updates installed via File > Office Account > Update Options.

If these steps don’t resolve the issue, the next option is to create a new Outlook profile or check if your mailbox is oversized, which can also cause sync problems.

Hope this helps you.  If it continues or these steps are too difficult, then I would suggest going to Microsoft.com and choose support.  You can chat with the Microsoft bot and can ask to be transferred to a real person.  If you have a subscription Microsoft 365 then your support will be free.
Merry Christmas
John A.

“In the space for the folder path and files a the message x Error appears before the folder/file list. It says a sync error to outlook classic. The 2 arrows indicate that syncing is in process, but it has been like this for a few days.”

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