I already figured it out by doing that, except Maildir directories don't work if doing this, hence I went back to mbox inline file style. I figured out that the problem that I was having was with the entry in main.cf [ mailbox_command = /usr/bin/procmail ] - I had to comment it out. Also, if using virtual domains then mydestination needs to include any other virtual domain that you use.
I think I will stick with mbox format instead of Maildir. IMAP handles mbox better than POP since it reads the headers only, thus making the scanning a lot faster; this is especially important for Inboxes with thousands of messages. Maildir is just too complicated and anyways, eMail is not designed for long term storage so I will reduce the mailboxes to no more than a couple of hundred megabytes of size and do auto-prunning every 3 months. I feel sorry for admins who do not plan and policy this ahead of time.
I'd like to hear other opinions about Postfix from others...