CU = Cumulative Update. Between each service pack release, Microsoft
releases what they call "hot fixes" for bugs reported by customers. These
are generally released as they become available. Every two months, Microsoft
now bundles (This is a new go-forward strategy for the Office Suite) all of
the updates into a Cumulative Update and each CU contains everything that
was previously released. Eventually, these bundles become a Service Pack.
Understand that hot-fixes and CUs are not fully regression tested as Service
Packs are supposed to be. I say this because Service Packs can have
regression errors but they have gone through more rigorous testing than hot
fixes and CUs.
Some IT shops refuse to install anything but Service Packs. IMO, this is too
limiting with Project Server 2007 as the fixes that Microsoft has been
releasing have been too important to shelve because of arbitrary rules. You
need to decide what your best-practice is going to be and so much depends on
what constraints your organization imposes on you and how the system is
functioning. If you aren't encountering problems, then you can ignore an
update. If you have a problem that is fixed by an update, wouldn't you want
to install it?
When I say that I haven't tested it, I'm referring to our company's policy
not to recommend updates to our clients without first installing the updates
in our lab and running our own set of tests. Sometimes we discover issues
that Microsoft missed, sometimes we don't. One thing is certain, once the
update is released and people encounter problems with it, you are very
likely to hear about it first in this community, or through one of the
bloggers who participate here!
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Gary L. Chefetz, MVP
MSProjectExperts
Project Server Consulting:
http://www.msprojectexperts.com
Project Server Training:
http://www.projectservertraining.com
Project Server FAQS:
http://www.projectserverexperts.com
Project Server Help Blog:
http://www.projectserverhelp.com