All smooth-at least for the actual upgrade...
except it removed other folders I had in opt/zimbra/tomcat/zimbra/. (i was starting to make an internal portal for end users to download the connectors etc)
So I made a backup of the new folder (just named it tomcat/zimbra455backup/)
Went to my backup of 4.5.4, and copied tomcat/zimbra/ over.
Everything works good...and today I cleaned up stuff/deleted that tomcat/zimbra455backup... but I forgot about the connectors and wizards stored in tomcat/zimbra/downloads that I was supposed to move over
Literally remembered just as I did 'rm -rf zimbra455backup'
Their not available for download in the support portal either

Opened a ticket...sigh...
But my question though (and after searching
http://pm.zimbra.com/pm_patch.php?patch=4_5_5&status=Released%20(05/06/07)&rel=4.5&relName=Frank) is there any major changes to files in that folder (tomcat/zimbra/) I need to worry about?