A Rollup Update has been released for Outlook 2010. This is a non-security update which fixes the 3 attachment issues that were introduced with the June 2017 update (KB3203467);
- When you open an attachment whose file name includes an ellipsis (…) or an exclamation point (!), the files are blocked and you receive a warning message.
- If an email message includes an attached email message, and the attached email message’s subject line includes an unsafe file name extension, the email attachment is blocked for recipients.
- You receive an error message when you open attachments in an email message, a contact, or a task that’s formatted as Rich Text.
Update July 11:
Due to new issues found with this update, it is no longer available. An updated fix or a completely new fix will be released soon.
Note: This update can be installed via Microsoft Update and updates Outlook to version 14.0.7183.5002.