ACTION REQUIRED: Prepare for the CS8, CS14, CS15, CS16, CS17, and CS18 Sandbox Migration

As an admin of a Salesforce org with at least one sandbox currently on CS8, CS14, CS15, CS16, CS17, and/or CS18, we want to inform you of an upcoming maintenance that involves moving these instances to new and improved infrastructure.

In order to provide exceptional performance, availability, and reliability of our service, we occasionally need to perform a capacity planning activity, called a sandbox migration, where we move all customers on an existing Salesforce sandbox instance onto new infrastructure.
What action do I need to take?
If your corporate network settings or email security filters restrict access to IP ranges, please ensure that you are including the current Salesforce IP ranges. If you continue to restrict access to certain IP ranges, users may be unable to access the sandbox following the migration. We made updates to our IP ranges in February 2017.
When will the sandbox migrations occur?
The CS8, CS14, CS15, CS16, CS17, and CS18 sandbox migrations will take place between 7 p.m. and 11 p.m. US Pacific Time on Saturday, May 20, 2017. During the maintenance, your sandbox(es) will be available in read-only mode.

NOTE: If you refresh your sandbox between now and May 20, 2017, there is a chance your new sandbox copy may still be placed on a migrating sandbox instance.
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