The way a corporate user would enable macros is to place the vba in a template which can be pre-loaded to the user machines so that the code is already trusted. Then your documents don't need to contain any code but they have that template set as the attached template.

Because the code is then coming from a trusted location, it can run without requiring 'enabling' or unblocking.

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Andrew Lockton
Chrysalis Design, Melbourne Australia

The message is related to the origin of the files, not that they contain macros. Documents received by email or downloaded from the internet are automatically blocked for editing regardless of whether they contain code. When opened for the first time Word displays the message included in the initial post.