Why am I unable to open attachments in Outlook?

Check that you have the correct software installed
In order to open attachments in Microsoft Outlook, you need to ensure that you have the necessary programs and files installed in your computer.
Check that the file is not corrupted or damaged
If the file you are attempting to open has been damaged or corrupted it may be unable to open in Outlook.
Check that the extension of the file is appropriate
Depending on the type of file, you may not be able to open it in Outlook. Make sure the file you are attempting to open is associated with Outlook.
Check if the email address listed is incorrect
In some cases, the email address listed may be incorrect or not verified with your Outlook program. Check that the email address is correct before attempting to open the attachment.