Not sure if this should be asked here or in the OLK area, but I wanted to know what the upgrade process is for server and OLK. Do I have to upgrade the OLK after a zimbra server upgrade, or will the existing one suffice temporarily?

I want to upgrade a client's server, but I dont get into their office a lot, so was wondering if I can do the server and then OLK in a week or 2, or is that not recommended practice?

They are on 5.0.2 and I am looking to bring them up to current version.