Yes, you should remove the licence file, when you've undeployed the licence zimlet I'd rename the directory it's in then do a full backup of the /opt/zimbra directory structure with Zimbra stopped. When you've done that try an upgrade to 4.5.11 and make sure that's OK, if you're happy it's working then do another backup of /opt/zimbra then run an upgrade to the current release. If that's all OK the backup again and run the NE upgrade over your current OSS installation.
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Regards
Bill
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