After a new Service Pack is released for a product (for example, Exchange 2010 Service Pack 1), users and management can get very excited about new features that the Service Pack will bring that will help them out, or fix problems that they had been having with the product.
Microsoft generally test their Service Packs very well, but things can go wrong.
As a general rule, we wait 4 weeks before installing a new Service Pack, and tell everyone to hold their horses.

Figure 1 - Even though managers and users might be pressing you to install a Service Pack - tell them to hold their horses!
After the 4 week period has expired perform the following tasks before installing the Service Pack:
Following this rule should prevent disaster in the event that a Service Pack is troublesome.