Microsoft Outlook or any other Email Client should be Set as a default Email Client to handle the email request sent by Word.
MSMAPI files are used to describe Message Services and thier Service Providers. Locate & Rename MSMAPI32.dll to MSMAPI32.old.
Outlook can be used safely in Safe Mode when encountered errors. Once Outlook in Safe mode and turn off the third party add-in.
Outlook does not send emails with attachments that exceed 20 MB. Increase Outlook Attachment Size Limit from Registry Editor.
If you have start receiving the error after the installation of an Office application, try to fix the error by repairing the Office installation.
Multiple Office installation can also cause error “Word MAPI failure”. Consider removing MS Office versions installed and check again.
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