Run Outlook in Normal Mode (Non-Compatibility Mode)Ĭompatibility mode is used to run applications that are not compatible to run in the current OS.
After updating, restart Outlook and check if Outlook is functioning normally.Ģ. Click on the Update Now for updating the software. If the current error is a result of a bug that Microsoft has already patched in its latest updates, then updating the Outlook to the latest version may solve the problem. Microsoft frequently releases updates for Outlook to improve its performance, add new features to it and to fix bugs in it. Also, if you are on a corporate network, then inform your organization’s I.T. How to Resolve the Operation Failed Attachment Error on Outlook?īefore moving with troubleshooting make sure you have administrator access to the system. If they are not set properly or they restrict attachments, you will experience the attachment error message. 
Conflicting/duplicate rules: Rules are automated actions performed on the basis of certain criteria. Drafts folder permission issue: The drafts folder saves messages that have to be sent later on, and due to a software glitch, many users experienced the current error message. 
Corrupted Office/Outlook installation: If Office/Outlook installation itself is incomplete, then Outlook will be unable to attach attachments successfully. Conflicting Outlook Add-ins: Add-ins add greater functionality in Outlook but conflicting Add-ins are another story and cause problems like the one under discussion. These applications may include Anti-virus/Firewall etc. Conflicting applications: Conflicting applications on your system can cause many Outlook problems like the current one. pst file: Outlook needs access to the PST file to perform tasks and if due to any reason it cannot access the PST file or if the PST file has corrupted, then it will display the problem you are facing presently. Outlook being run in Compatibility mode: In compatibility mode, certain required components of Outlook will not be able to perform their legitimate operation and thus will cause the current error. If you are using an older version of Outlook, then you are inclined to many issues. Older Version of Outlook: To keep the pace up with the emerging technologies, Microsoft releases an updated build of Outlook now and then. There are numerous reasons for this issue to occur, we’ve gathered almost all of them as listed below. 
Why does Outlook returns operation failed attachment error?
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