An old, old “bug” has been addressed in the upcoming release of Enterprise Vault 9.0.2. When exporting an archive to PST, you could specify a size limit for the file bigger than 1.5-1.8 Gb.
Now you can !
You can now go up to 20 Gb for a Unicode PST, 1.5 Gb for the old-school “2Gb max” ANSI PST. And yes, it works.
Here is a nice picture of two exports of the same archive .. One where I picked 2.2 Gb for the size, and one where I picked 3.6 Gb for the size of each PST :