Downloaded and saved the PAF "installer" to the computer hard disk; then installed onto usb flashdrive OUTSIDE of the portableapps platform.
The paths for this on the usb flash drive is this way:
Removable Disk E:\OperaMailPortable, and inside of this are folders,
There are a few duplications of folders which also occur inside these three subfolders. The operaMailPortable forlder only has two other items:
help.html and OperaMailPortable.exe
I have opened and used OperaMailPortable and setup two of my email accounts for this email client and have seen the listings of emails within the running email client, and opened and read a few of the messages.
No doubt whatsoever, I am doing this through the OperaMailPortable email client, and not through the Opera web browser.
I could give more directory structure information, but would it really be helpful? Any idea what sizes and file extensions to recognize as the email messages? What I notice, not very accurately, since setting up the two email accounts with OperaMail, I have found very little if any change in used flash drive storage capacity. Maybe about 0.01 GB change or increase.