Lets suppose you had all Linux computers. Let's suppose your workaholic spouse was brutally let go, and the Outlook access cut off. So, what do you do? You cut off their network immediately, and you use the outlook email on the laptop. Then you use outlook's backup to pst format.
Then you load a usb disk with the *.pst files. Now the tough part. You convert the pst to mbox files, with readpst. Gmail has no import function. So you install thunderbird, the importexport add on. and akonadi-import-wizard. You can take the mbox file and put it into a folder with thunderbird. You can attach thunderbird to gmail.
Yeah, now you can send the emails to the wife's new gmail account. Yeah!
After, you wipe the corporate laptop and send it back.