---
# System prepended metadata

title: 'QuickBooks QBMapi64 Out of Memory Error on Windows 10: Complete Troubleshooting Guide'
tags: [QBMapi64 Out of Memory Error in QuickBooks Desktop, QBMapi64 Out of Memory Error]

---

# QuickBooks QBMapi64 Out of Memory Error on Windows 10: Complete Troubleshooting Guide

The *QBMapi64 Out of Memory Error* in QuickBooks is a frustrating issue that typically occurs when sending emails—especially invoices, reports, or transactions—through QuickBooks Desktop on Windows 10. Despite the message suggesting a memory shortage, the problem is rarely about actual RAM. Instead, it usually stems from compatibility issues, damaged components, or misconfigured email settings.

This in-depth guide explains what causes the QBMapi64 error and how to fix it effectively.

![QB 888-463-3385](https://hackmd.io/_uploads/B1QOZC0qZg.png)


## What Is the QBMapi64 Out of Memory Error?

QBMapi64.exe is a QuickBooks component responsible for handling email communication via MAPI (Messaging Application Programming Interface). When this process fails, QuickBooks displays an “Out of Memory” error—even if your system has plenty of available memory.

This error commonly appears when:

* Emailing invoices or reports
* Using Outlook integration
* Running QuickBooks on Windows 10
* Switching between email methods


## Main Causes of QBMapi64 Error

### 1. Damaged QBMapi64 Component

The QBMapi64.dll file may be corrupted or missing.

### 2. Microsoft Outlook Issues

QuickBooks heavily relies on Outlook for email integration. Problems with Outlook configuration can trigger the error.

### 3. Incorrect Email Preferences in QuickBooks

Improper setup of email settings can interfere with sending emails.

### 4. Windows 10 Compatibility Conflicts

Certain Windows updates or system configurations may conflict with QuickBooks processes.

### 5. Background Processes Conflict

Other applications running in the background may block QBMapi64 execution.


## Symptoms You May Notice

* Error message: *“QBMapi64 Out of Memory”*
* QuickBooks crashes when sending emails
* Emails fail to send or freeze
* System lag during email operations
* Outlook not responding when triggered by QuickBooks



## Step-by-Step Fixes

### Solution 1: Rename the QBMapi64 File

This forces QuickBooks to recreate a fresh file.

* Navigate to:

  ```
  C:\Program Files (x86)\Common Files\Intuit\QuickBooks
  ```
* Locate **QBMapi64.exe**
* Right-click → Rename (e.g., `QBMapi64.old`)
* Restart QuickBooks and try sending the email again



### Solution 2: Update QuickBooks Desktop

* Open QuickBooks
* Go to **Help > Update QuickBooks Desktop**
* Click **Update Now → Get Updates**
* Restart QuickBooks

Updates often fix known bugs affecting QBMapi64.



### Solution 3: Repair Microsoft Outlook

* Open **Control Panel**
* Go to **Programs and Features**
* Select Microsoft Outlook (or Office suite)
* Click **Change → Repair**

Restart your system after the repair.



### Solution 4: Check Email Preferences in QuickBooks

* Go to **Edit > Preferences**
* Select **Send Forms**
* Choose the correct email method:

  * Outlook
  * Web Mail

Ensure the correct email account is selected and configured.



### Solution 5: Run QuickBooks as Administrator

* Right-click QuickBooks icon
* Select **Run as Administrator**

This ensures proper permissions for email operations.



### Solution 6: Disable Antivirus Temporarily

Security software may block QBMapi64:

* Disable antivirus/firewall temporarily
* Try sending email
* Re-enable protection afterward



### Solution 7: Close Background Applications

* Press **Ctrl + Shift + Esc**
* Open Task Manager
* End unnecessary processes

Freeing system resources can help resolve conflicts.



### Solution 8: Use QuickBooks Tool Hub

* Download and install **QuickBooks Tool Hub**
* Go to **Program Problems**
* Run **Quick Fix my Program**

This tool repairs common QuickBooks issues.



## Advanced Fixes

### Reinstall QuickBooks (Clean Install)

If the issue persists:

* Uninstall QuickBooks
* Use Clean Install Tool
* Reinstall QuickBooks

This resolves deep corruption issues.



### Create a New Windows User Profile

* Go to **Settings > Accounts > Family & Other Users**
* Add a new user with admin rights
* Log in and run QuickBooks

This can fix profile-specific issues.



## Prevention Tips

* Keep QuickBooks and Windows updated
* Regularly update Outlook
* Avoid running too many background apps
* Configure email settings correctly
* Perform routine system maintenance



## When to Seek Help

If none of the solutions work:

* Contact QuickBooks support **+1-888-463-3385**
* Consult an IT professional
* Check for deeper Windows or Office conflicts



## Conclusion

The QBMapi64 Out of Memory Error in QuickBooks Desktop on Windows 10 is usually caused by configuration or compatibility issues rather than actual memory shortages. By following the steps outlined above—such as renaming the QBMapi64 file, repairing Outlook, and updating QuickBooks—you can resolve the error and restore smooth email functionality.

Taking preventive measures will also ensure that your QuickBooks experience remains stable and interruption-free.