If you are using Dynamics CRM Online , you may ask why the last week of the month is not available for CDU schedule, such as upgrading to CRM 2015.
This is due to the fact that it is reserved for security patching and service updates as some may not be compatible with the CDU and need to be performed separately.
Operational lockdowns (such as events) might also result in CDU dates not being available.
There will be no exceptions for those dates as we cannot delay a site-wide update.
More info on CDU:
EMEA Dynamics CRM Support Team
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