lost of emails when importing .pst from windows to Mac

Hi,

I decided to migrate to Mac and to continue to work in the email environnement under outlook mac.

I exported my box into a backup.pst file

Copied it on the mac.

Imported backup.pst into outlook for mac.

some emails disapered (1/3) in the inbox and the outbox.

Without any logic. but all the most recents under (2 months).

Suspecting a bug in the fonction, I did it again box by box (inbox, outbox)... Same result

Then I tried to import "outlook.pst" file

the result is different : I still miss emails... but not the sames !

any idea

Thx for your help.

Have a nice day