If you experience a critical problem with Exchange 2007, the fix process resembles the fix process of earlier versions of Exchange. We use the following process to help resolve the problem:
1.You work with a Customer Support Specialist or with the Microsoft Escalation Services personnel to troubleshoot the problem.
2.The Customer Support Specialist or the Microsoft Escalation Services person escalates the fix request to the Exchange Customer Experience Team.
3.The Exchange Customer Experience Team creates an interim fix to resolve the problem.
4.The Exchange Customer Experience Team offers this fix to help resolve the problem until the next scheduled update rollup package that contains the fix is released.
Note: We deliver the interim fix under the same service-level agreement that is currently used. However, an additional agreement states that you must remove the fix when an update rollup package that contains the fix is released. Then, you must reinstall the fix by using the appropriate update rollup package. This agreement helps guarantee that the Exchange installation is restored to a known and quantifiable state as soon as possible.
Interim fixes (interim updates) and cumulative update rollup packages benefit from much of the same testing. However, an interim fix does not receive the comprehensive testing that we perform for an update rollup package. Additionally, an interim update is specific to a particular update rollup. For example, an interim update that we create to fix a problem in the release version of Exchange 2007 may not function correctly on an Update Rollup 2 for Exchange Server 2007 installation. Therefore, if you receive an error message when you try to install an interim update, you may be experiencing one of the following problems:
•You have another interim update installed.
•You are trying to install an interim update that was designed for a different update rollup package.
Interim update interaction with update rollup packages
If you have an interim update installed in Exchange 2007, you must remove the interim update before you apply the next update rollup package. To remove the interim update, use Add or Remove Programs in Control Panel. If you do not remove the interim update before you install an update rollup package, you may receive an error message when you try to install the update rollup package. You may also receive an error message when you try to install an earlier update rollup package after a later update rollup package has been installed.The main technical reason why only one interim update installation is allowed is that all interim updates for a particular rollup package share the same build version. This means that if you have an interim update installed, and if you enable a second interim update to be installed, any files that are common to both interim updates will not be installed when the second interim update is installed. Therefore, the fix may not be installed when the second interim update is installed. The seemingly obvious alternative is for each interim update to have a unique build version. However, this condition would cause currently installed changes to be overwritten. This means that a previously installed fix would no longer function. To avoid these conditions, we have implemented a blocking strategy. This strategy lets only a single interim update be installed. The fact that all interim updates for a particular rollup package share the same build version is also the technical reason for the following requirements:
•You must uninstall an interim update before you install an update rollup.
•You must install the correct update rollup before you install an interim update.