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Troubleshoot QBmapi64 Out Of Memory Error in Just 5 Minutes

4/9/2026

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No doubt, QuickBooks can also face memory issues, specifically when it fails to manage it effectively. At this point, you may encounter the QBmapi64 out of memory error. It mainly occurs due to large company files, insufficient system resources, corrupt installation, and many other reasons. This usually occurs during email invoicing, printing, or report generation. The error can manifest in various ways that include system slowdown, crashes, or failure to open files. 
Let’s get deeper into the matter to explore all the information given by the experts to smooth the troubleshooting process. 

Facing the QBmapi64 out of memory error? Call our experts now at +1(800) 780-3064 for quick and reliable support!

Possible Causes Behind Out Of Memory Error in QB
You can receive a QBmapi64 out of memory error due to the reasons mentioned below: 
  • A poor or unstable internet connection can cause it.
  • You may face this problem due to Windows firewall or antivirus restrictions.
  • The problem may arise due to wrong date and time settings on your computer.
  • An outdated Windows Operating System can be one of the reasons behind it.
  • It can be due to a damaged or corrupted mapi32.dll file.
Step-by-Step Guide to Solve the QBmapi64 Out Of Memory Error
Multiple solutions can help you eliminate the QBmapi64 out of memory error. Some of them are explained below: 
Technique 1: Set MS Outlook as the default application on Windows
  • Open the Start menu.
  • Search for default apps.
  • After this, you will see the Choose Default Apps window.
  • Choose Mail, and then the Choose an App window will open.
  • Now, you need to click on Outlook to make it your default mail application.

Technique 2: Edit QuickBooks preferences
  • Open the QB application.
  • Log in to the company file.
  • Next, you need to head over to the Edit menu.
  • Choose Preferences.
  • Jump to the Send Forms option.
  • Click Outlook, then Add.
  • Choose the email provider and later, input the email address.
  • At this point, ensure that the Use Enhanced Security checkbox is marked.
  • Tap OK and enter the admin password if you are asked to do so.

Technique 3: Verify the internet connection settings
  • Open the Run window by pressing Win+R.
  • Now, in the search space, type Control Panel and open it.
  • Head over to the Network and Internet.
  • Choose Internet Options and then take your cursor to the Advanced tab.
  • Scroll down and mark only the Use SSL 3.0 box.
  • Move to the Content tab.
  • Tap on the Clear SSL State option to save the changes.
  • Now, close the settings window.
  • Finally, restart your QB application and send a test email or PDF as an attachment to see if the error is resolved. 
Summary
To make an outline of this blog, QBmapi64 out of memory error indicates that the qbmapi64.dll file is exhausting system resources. This also uncovers segments about causes and solutions. We hope that you will be able to easily execute each step and overcome the problem. If you don’t want to take a risk by fixing it alone, dial TFN +1(800) 780-3064 and seek professional help. 

FAQs
1. What is the QBmapi64 out of memory error in QuickBooks?
The QBmapi64 out of memory error occurs when QuickBooks fails to send emails using Outlook due to insufficient memory allocation or a damaged MAPI (Messaging Application Programming Interface) file. It usually appears when trying to email invoices, reports, or transactions.

2. Why does QBmapi64 out of memory error happen?
This error can be triggered by several reasons, including:
  • Corrupted or damaged QBmapi64.dll file
  • Improper integration between QuickBooks and Outlook
  • Outdated QuickBooks or Outlook version
  • System memory limitations or background app overload
  • Incorrect email preferences setup

3. How can I fix QBmapi64 out of memory error quickly?
You can try these quick fixes:
  • Restart your computer and close unnecessary programs
  • Rename or repair the QBmapi64.dll file
  • Update QuickBooks and Microsoft Outlook
  • Run QuickBooks as Administrator
  • Reconfigure email settings in QuickBooks

4. Does reinstalling QuickBooks fix QBmapi64 error?
Yes, reinstalling QuickBooks can fix the issue if the error is caused by damaged program files. However, it’s recommended to first try repairing QuickBooks using the Control Panel > Programs > Repair option before doing a full reinstall.

5. Can antivirus or firewall cause QBmapi64 out of memory error?
​
Yes, sometimes antivirus or firewall settings block QuickBooks from accessing email components, leading to this error. Temporarily disabling security software or adding QuickBooks as an exception can help resolve the issue.
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