[Rydia]

One of my coworkers is having trouble with her Microsoft 2007 mail merge
capabilities.

I am able to access the same documents with the same mail merge datasources
(on a network drive) however, she cannot.

If we try to "Use a New List" from her machine, we get an error "Class Not
Registered."

After locating the datasource, even though it's saved in the document, we
tried to use the existing list but modify the data. We received another
error indicating:

"The connection to the recipient list has been lost. Check that the file
has not been moved or deleted and that the network location is accessible."

Accessing the datasource works perfectly fine from my machine and several
other co-workers machines.

What could possibly have happened that would drop her access to Mail Merge?