Charset behaves differently on different servers

[steal]

A recent update resulted in Spanish characters rendering incorrectly in QA. I added the following line to the .asp files to try and correct it.
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

This worked fine in QA but not production. When I changed it to
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
It worked in production but not QA.

Are there server settings that are likely causing this? Where do I look?

[lammert]

Steal, first of all Welcome to WebmasterWorld!

A webserver can send a HTTP header which defines the charset. If this header is present, the meta setting in the head section of your HTML code is ignored.

Unfortunately I have no IIS system currently available so I can't tell you how to change this header send behaviour on a Microsoft based webserver.

[steal]

Thanks Lammert,
Anyone out there know how to control this behaviour w/ MS IIS?