{"id":107209,"date":"2022-08-19T08:58:59","date_gmt":"2022-08-19T08:58:59","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=107209"},"modified":"2026-05-29T06:09:55","modified_gmt":"2026-05-29T06:09:55","slug":"exchange-cached-mode-not-updating-mail-folders","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/exchange-cached-mode-not-updating-mail-folders\/","title":{"rendered":"How to Fix Outlook not Updating Mail Folders in Cached Exchange Mode?"},"content":{"rendered":"

Outlook not updating or failing to update folders or mail items is a common but serious problem that many Outlook users experience every once in a while. This problem may trigger due to one or more reasons associated with Outlook client, profile, or data file (Offline Storage Table or OST).<\/p>

Although the mailbox is synchronized and changes can be seen in the Outlook Web App (OWA) or Outlook Web Access and Online Mode, Outlook does not reflect the changes in Cached Mode (also referred to as Offline Mode).<\/p>

In this blog, we have discussed the reasons for the ‘Outlook in Cached Mode is not updating folders from Exchange’ problem and shared some solutions to resolve the issue.<\/p>

Why Does Outlook Stop Updating Folders in Cached Exchange Mode?<\/h2>

MS Outlook utilizes Cached Exchange Mode<\/strong><\/a> to save a local replica of your mailbox data in an Offline Storage File – OST. This lets you to access the data without internet or server connectivity. However, there might be some situations where such local cache synchronization fails due to multiple internal\/external factors, leading to problems in accessing your mailbox items.<\/p>

The problem may also occur when the messages are stuck in the incoming item processing pipeline due to unexpected conflicts or corrupt data. The pipeline<\/em> feature was first introduced in Outlook 2007 that uses the hidden ItemProcSearch<\/strong> folder in your mailbox to process messages before showing them in your Outlook Inbox<\/strong>.<\/p>

Refer to the table below to understand the causes of this issue:<\/p>

Cause<\/strong><\/td>What it means<\/strong><\/td><\/tr>
Work Offline mode is enabled<\/strong><\/td>Outlook has been manually disconnected from the server, which is the most common cause and also the easiest to fix.<\/td><\/tr>
Incorrect email sort order<\/strong><\/td>Emails are updating correctly but may appear at the bottom of the mailbox instead of the top.<\/td><\/tr>
ItemProcSearch pipeline stuck<\/strong><\/td>The incoming mail processing pipeline is stuck, preventing new emails from appearing until it is cleared using the \/cleanips switch.<\/td><\/tr>
Corrupted Outlook cache (RoamCache)<\/strong><\/td>Damaged or outdated cache files interfere with Outlook’s synchronization process.<\/td><\/tr>
Oversized OST file<\/strong><\/td>An OST file larger than 20–25 GB<\/a> can slow synchronization and cause Outlook to miss mailbox updates. In severe cases, this can also trigger an Outlook out of memory error<\/a>.<\/td><\/tr>
Faulty or incompatible add-ins<\/strong><\/td>A certain Outlook add-in may cause interruptions to the send or receive and the synchronization process.<\/td><\/tr>
Corrupt Outlook profile<\/strong><\/td>A damaged or corrupt Outlook profile<\/a> can prevent successful server communication and block authentication attempts.<\/td><\/tr>
Damaged Outlook program files<\/strong><\/td>Corrupted Outlook installation files can block normal mailbox synchronization operations.<\/td><\/tr><\/tbody><\/table><\/figure>

Which Method Should You Try First?<\/strong><\/h2>

The below table will help you to quickly choose the most relevant solution based on your situation.<\/p>

Situation<\/strong><\/td>Try this method first<\/strong><\/td>Time needed<\/strong><\/td><\/tr>
Outlook shows “Working Offline” in the status bar<\/strong><\/td>Method 1 — Disable Work Offline<\/td>1 minute<\/td><\/tr>
Emails arrive on phone\/OWA but not in Outlook desktop<\/strong><\/td>Method 3 — \/cleanips switch<\/td>2 minutes<\/td><\/tr>
Some folders update but one specific folder does not<\/strong><\/td>Method 4 — Clear Offline Items<\/td>3 minutes<\/td><\/tr>
Outlook is slow and the OST file is over 20 GB<\/strong><\/td>Method 7 — Adjust Sync Slider or Method 8 — Archive<\/td>10 minutes<\/td><\/tr>
The issue started after installing a new add-in<\/strong><\/td>Method 9 — Remove faulty add-ins<\/td>5 minutes<\/td><\/tr>
Outlook profile was recently changed or migrated<\/strong><\/td>Method 10 — Create new profile<\/td>10 minutes<\/td><\/tr>
None of the above apply — general sync failure<\/strong><\/td>Method 1 first, then Method 5, then Method 11<\/td>15–30 minutes<\/td><\/tr>
You are an IT admin managing Exchange for multiple users<\/strong><\/td>Method 12 — Force sync via PowerShell<\/td>5 minutes<\/td><\/tr><\/tbody><\/table><\/figure>

Methods to Fix Outlook not Updating Mail Folders in Cached Mode<\/strong><\/h2>

First check your internet connection. If your network connection is inconsistent or slow, then restart your router or connect with your internet service provider. If the issue persists, follow the solutions mentioned below in sequence to fix this issue in all Outlook versions.<\/p>

Method 1<\/strong> – Disable Work Offline and Force an Update<\/strong><\/h3>

If Work Offline mode is enabled in your Outlook, then it means the application is disconnected from the Exchange Server. This is the reason for Outlook not updating the mail folders issue. You can fix this problem by disabling the mode. Here’s how:<\/p>