Outlook has Exhausted All Shared Resources Please Close All Messaging Apps

Recognizing the Error Message

When Outlook encounter issues its shows error message such as:
“Outlook has exhausted all shared resources please close all messaging applications and restart Outlook”.

This error may appear when launching Outlook, while sending or receiving emails, or after using Outlook alongside other messaging tools like Microsoft Teams. You might have Outlook slow performance, frequent crashes or Outlook freezes unexpectedly.

These symptoms point to Outlook struggling to access and manage the system resource it shares with other programs. Recognizing the exact word of the error helps to identify the root cause efficiently and apply to fix it.

Why Does It Happen (Causes)?

• Running messaging apps such as Microsoft Teams or Zoom alongside Outlook can consume shared communication resources. When these programs compete for access, Outlook may fail to get what it needs to operate properly.
• Connecting batch PST files can overload Outlook data handling capacity. The more files or accounts you have, the memory Outlook uses often exceeds its shared resource limit.
• Cached Exchange Mode download mailbox data. When used with large accounts or shared mailboxes, it increases memory and storage usage, and Outlook has exhausted all system resources.
• If the Outlook folder list becomes corrupted, Outlook may fail to open correctly and use system resources to render and restore it, leading to this error.

Quick Fixes to Resolve Outlook Has Exhausted All System Resources

• Close Messaging apps such as Microsoft Teams or Zoom before launching Outlook. These programs often compete for shared system resources. After closing them, relaunch Outlook to refresh its access to memory and system processes.
• Disconnect unneeded PST files or shared mailboxes by going to file and click on Account Settings and press on Data files. Fewer active data resources can significantly reduce Outlook memory usage and restore functionality.
• A corrupted navigation pane can affect system resources. Reset it by closing Outlook and press Win+R and type Outlook.exe /resetnavpane.
• Navigate to file and click on Account Settings and hit on Account Settings again. Select your email account and tap change and uncheck Use Cached Exchange Mode. This forces Outlook to fetch data live and reduce system resources especially for large mailboxes.

Step-by-Step Fixes to Resolve Outlook has Exhausted All Shared Resources

If quick fixes doesn’t work to solve Outlook has exhausted all shared resources then follow advanced troubleshooting as we have discussed below:

Method 1. Close and Relaunch Outlook

1. First, close Outlook and check Task Manager to close if found.
2. Relaunching Outlook to free up memory and system resources.
   

Method 2. Disable Problematic Messaging Applications

1. Open Outlook and navigate to the file.
   
2. Click on options and go to Add-ins.
   
3. Choose COM Add-ins and select communication related Add-ins.
   
4. Now, Relaunch Outlook to see errors may be resolved.
   

Method 3. Compact OST File

1. Navigate to file and click on Account Settings.
   
2. Press on data files and click on Settings.
   
3. Tap on Compact Now button to reduces the size of OST file then click OK button.

Method 4. Reset Nav Pan via Command Line

1. Press Win+R and type outlook.exe/resetnavpane.
   
2. Hit Enter to reset Mailbox folder pane.

Method 5. Adjust Registry for PST Cache

1. Open Registry Editor and navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\PST
   
2. Add it a new DWORD: use UseLegacyCacheSize.
   
3. Set its value to 1 to enable a large cache size limit.
   

1. Download and run Recommended Software on your system.
   
2. Click on Convert configured Outlook mailbox data and check on Recovery Mode.
   
3. Preview to select OST folders as you want to convert.
   
4. Choose the PST file in the list of Saving options.
   
5. Browse destination path and select advanced filter.
   
6. Now, press on the Convert button to get healthy PST file and easily access on any Outlook account.
   

Remarkable Qualities of Recommended Software

• This software can also convert OST to PDF, PST, EML, MBOX, CSV and many more.
• It also offers a user-friendly interface to make it a reliable solution for all professional and individual users.
• You can also import OST to Outlook without losing any data.
• With this wizard, you can also use filters such as create PST year wise, separate PST per user, split PST, exclude folder, skip empty folder and many more.
• This software also offers you to import OST to Microsoft 365, Gmail, Thunderbird, Yahoo, Zimbra and all IMAP Supported email platforms.

Let’s Wrap Up

The Outlook has exhausted all shared resources please close all messaging applications can be frustrating and lots of users searching for similar queries. So, we have decided to share a solution to fix all user queries and can continue to use Outlook without facing any relevant issues similar to these.