It says:
Code:
Preparing packages for installation...
usermod: Account `zimbra' is currently in use.
error: %pre(zimbra-core-3.0.0_GA_156.SuSE10-20060206105821) scriptlet failed, exit status 15
error: install: %pre scriptlet failed (2), skipping zimbra-core-3.0.0_GA_156.SuSE10-20060206105821
After logging out on the other SSH session it worked...

With some more elaboration on the error on the prompt (and not in the log)
I would have saved my emails...