Hello
Have a problem here and I have not found anything about this on MS Office
Support site.

We use a generated HTML file as a datasource for the Mail Merge from our
application.

The problem arizes when the number of Merge Fields defined in the HTML file
exceeds 63(!).

After I open the datasource in Merge Document I can see only first 63 Merge
Fields in the 'Insert Merge Field' dialog. And the 63rd merge field name is
composed of the names of merge fields which come after the 62th field(!)

However when I use the comma-separated file or an SQL datasource I do not
experience any problems - I have tried with datasources with more than 100
fields.

Do you happen to know what the problem may be?