wrote:

is there any reason , after importing an ansi pst file, that it would
convert it to the old ansi format ?

In order to import a PST, you must have a PST open to begin with to act as
the destination of the import. That PST's format will not change. If you
import a Unicode PST into an ANSI PST, if there is no Unicode data in the
Unicode PST, I suspect it would import and the destination PST, since it
started as an ANSI PST would remain an ANSI PST.

That said, why would you ever want to import a PST. Just open it with
FileOpenOutlook Data File.
--
Brian Tillman