On a weekly basis, Microsoft may apply needed critical or security updates to the Microsoft operating system or infrastructure on Microsoft-managed Dynamics 365 Finance and Operations Sandbox Tier-1 (Develop and Test – Single-box) machines. This maintenance will occur during your regional maintenance weekend window (Friday, Saturday, or Sunday). In addition to Microsoft operating system updates, there may be updates to other Microsoft products. This periodic maintenance does not include service updates to Microsoft Dynamics 365 Finance and Operations. There is no option to opt-out of this periodic maintenance. For more details, please see the Planned Maintenance FAQ.