Personal Folders
 

I've read/heard that it is not good to leave much info in the Inbox because
it might cause it to corrupt. I've told a friend this, and he's "dutiful"
to frequently empty Inbox. However, I just saw that in creating his
personal folders, he has many of them as sub-folders to Inbox. Could these
sub-folders be considered as IN the Inbox, and thus also cause corruption?