I've got a second poa setup to process imap requests to my post office.
IMAP support sucks but I need to provide it for various reasons.
NFS is a pain as well.

I've currently got the post office NFS mounted on the second server and
(more often than I like) I end up with user databases locked and have to
shut down the second POA and remount the export there to release the locks.

I've tried sshfs which failed miserably and started corrupting database
files. Not too surprised by that but wanted to give it a shot.

Any other options available besides OES/NSS? Licensing is cost
prohibitive for supporting our webaccess users and the last I knew you
had to have OES connection licenses to run the poa on OES.