I'm generating a flat file in Outlook VBA. Right now I'm able to save it as a
..txt file, although I hope to save it in a delimited flat file format with an
..xls extension so it will automatically be opened by excel without having to
go through the whole 'import' sequence.

There are string fields in the file, some of which contain commas- so I
can't make it a comma delimited file.

What is the best delimiter to use so that Excel will automatically recognize
and parse the flat file contents across columns?

Currently in 2003, but strongly prefer solutions that will also work in 2007

Many thanks,
Keith