Solution Properties
Solution ID:
260624093904980
Last Modified Date:
Wed Jun 24 11:30:24 UTC 2026
Taxonomy Path:
Case category//I have a problem with...//email
Author:
[email protected]
ERROR: 'Failed to send the message using Outlook provider. Please ensure that ...'
Description

When you try to send emails from your software using Outlook, you can see the error:

'Unable to send all emails. Error with the address. Unknown Error. Check Windows event Log for more details.'

When you check your Windows Event Log, you'll see:

'Failed to send the message using Outlook provider. Please ensure that Microsoft Outlook is installed, or select a different mail provider. : System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Office.Interop.Outlook, Version=11.0.0.0 ... The system cannot find the file specified...'

Error sending email using Outlook error message.

NOTE:

If you see a different error, use our event log errors when sending emails with Microsoft Outlook or SMTP article.

Cause
Resolution

Check your Outlook version

  1. In Microsoft Outlook, go to File then About Outlook.
  2. Note your full version number. For example, (Version 2303 build 16.0.16227.20202) 32-bit.
  3. Note the two digits after Build and compare to the Version stated in the error message.

The version stated in the error is what your software is trying to use. If the build you noted from Outlook is different, this is the cause of the issue.

Repair Microsoft Office

  1. To resolve this issue, run a repair installation of Microsoft Office.
  2. If the issue persists, uninstall then reinstall Microsoft Office.

For help with doing this, contact your IT support.

NOTE:

You don't need to reinstall your Sage software. 

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