If ExtendSync is not loading, freezing, stuck on a spinner, or behaving unexpectedly, a quick and effective first step is to clear the add-in’s Local Storage and Session Storage.
This removes stale data and forces Outlook to reload a clean version of the app.
Follow the steps below.
Step 1: Right-Click and Select Inspect
Open the ExtendSync pane in Outlook.
Right-click inside the add-in window.
Select Inspect (this opens the Developer Tools panel).
Step 2: Clear Local Storage & Session Storage
In the web inspector window, navigate to the Application tab. This is where you can manage your app's local storage.
Clear Local Storage
In Developer Tools, go to the Application tab.
Expand Local Storage.
Right-click the ExtendSync entry → Clear.
Clear Session Storage
Expand Session Storage.
Right-click the entry → Clear.
This removes cached settings and data that may be interfering with ExtendSync.
Step 3: Reload the App
Press CTRL + R while Developer Tools is open
orClose Outlook completely and reopen it
This reloads ExtendSync with fresh data.
Step 4: Confirm Your Outlook Login
After reloading:
Ensure you’re signed into Outlook with your correct work email
Then relaunch ExtendSync to check if the issue is resolved
Still Having Issues?
If ExtendSync is still not functioning as expected:
💬 Chat with us using the icon at the bottom-right
📧 Email cloudextend-support@celigo.com
Please include:
Screenshots of the issue
Outlook version
OS and steps already taken