Outlook 2010/2013 Attachment Filenames Change

I've seen this problem happen a few times where a user attaches multiple files (for instance, 3 Excel documents) in Outlook 2010 or 2013 and the filenames/titles swap when the message is received.
This especially happens when MS Updates for the client machines aren't managed.

Example:

The Sender attaches:

Doc1 with the filename: ABC
Doc2 with the filename: DEF
Doc with the filename: GHI

The Recipient gets the message with:

Doc2 with the filename: ABC
Doc3 with the filename: DEF
Doc1 with the filename: GHI

As you can see, the filenames have switched; so the Excel files aren't what they started out as.

The problem is caused by the follwing Office updates:

- Office 2010 - KB3055041 and KB3085522

- Office 2013 - KB3085495

The best course of action to ensure that the Office suite is updated to the latest patch level, as there have been updates since, that correct this issue.

In the short-term you can remove the above updates, but it's better to patch Office to ensure full compatibility.