How do I fix: 🔍 Why This Happens?

The primary reason for this error is a limitation in Outlook's attachment size limit, which can vary depending on the version of the software being used. This limit is typically around 20-30 MB, but it may be lower in older versions. When you try to send an email with an attachment that exceeds this

How do I fix: Disable Corrupted Add-ins?

Step 1: Step 1: Open Outlook and go to File > Options > Trust Center. Click on the 'Manage add-ins' button.Step 2: Step 2: In the 'Add-ins' section, click on the 'Disabled Items' tab. Look for any suspicious or recently installed add-ins and check their status (enabled or disabled).Step 3: Step 3: I

Software⏱️ 3 min read📅 2026-06-11

How to Fix: Outlook Calendar Error "The attachment size exceeds the allowable limit", even when there is no attachment

Q: Best Solutions to Fix It Increase Attachment Size Limit?

Step 1: Step 1: Open Outlook and go to File > Options > Mail. Click on the 'Composing messages' tab and then click on the 'Send messages with large attachments' checkbox.Step 2: Step 2: In the 'Composing messages' section, you will see an option to increase the attachment size limit. Click on this o

Outlook calendar error fix for attachment size limit issue.

Quick Answer: Try using the 'Send as Attachment' feature in Outlook to avoid exceeding the attachment size limit.

📋 Table of Contents

🔍 Why This Happens
✅ Best Solutions to Fix It
🎯 Final Words

The 'Attachment size exceeds the allowable limit' error in Outlook can be frustrating, especially when it prevents you from updating or canceling meeting occurrences. This issue affects users who frequently send attachments with their meeting updates, such as those in a recurring meeting series.

This problem is particularly vexing because it occurs even when there are no attachments present. The good news is that we have identified the root causes and provided two effective solutions to resolve this issue.

🔍 Why This Happens

The primary reason for this error is a limitation in Outlook's attachment size limit, which can vary depending on the version of the software being used. This limit is typically around 20-30 MB, but it may be lower in older versions. When you try to send an email with an attachment that exceeds this limit, Outlook will display the 'Attachment size exceeds the allowable limit' error.
Another possible cause for this issue could be a corrupted or faulty add-in installed on your system. Some third-party add-ins might interfere with Outlook's functionality and lead to errors like this one.

✅ Best Solutions to Fix It

Increase Attachment Size Limit

Step 1: Step 1: Open Outlook and go to File > Options > Mail. Click on the 'Composing messages' tab and then click on the 'Send messages with large attachments' checkbox.
Step 2: Step 2: In the 'Composing messages' section, you will see an option to increase the attachment size limit. Click on this option and select a value that suits your needs (typically around 50-100 MB).
Step 3: Step 3: Save your changes by clicking 'OK'. This should allow you to send attachments larger than the default limit.

Disable Corrupted Add-ins

Step 1: Step 1: Open Outlook and go to File > Options > Trust Center. Click on the 'Manage add-ins' button.
Step 2: Step 2: In the 'Add-ins' section, click on the 'Disabled Items' tab. Look for any suspicious or recently installed add-ins and check their status (enabled or disabled).
Step 3: Step 3: If you find a corrupted or faulty add-in, disable it by clicking on the 'Disable' button next to its name.

🎯 Final Words

By following these steps, you should be able to resolve the 'Attachment size exceeds the allowable limit' error in Outlook. Remember to save your changes after increasing the attachment size limit and disabling any corrupted add-ins. If the issue persists, consider reaching out to Microsoft support for further assistance.

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