After January 2020 Microsoft will no longer issue security updates for either operating system. Once the official Microsoft support ends so will Sage support for Sage 100cloud running on either operating system (server or desktop).
These operating systems are over 10 years old (Both Windows 7 and Server 2008 R2 were released in October 2009) and if your company is using either (or both) the time to upgrade is now.
With the next release of Sage 100cloud due in April 2019, if your operating system is either Windows 7 or Server 2008 R2 then please plan to upgrade your server to become compliant with the latest Microsoft supported operating environments.
Windows 7 users can upgrade to Window 10, provided your workstations meet the Microsoft OS requirements.
Windows Server 2008 R2 users have a slightly different set of options. Many companies have started moving their servers to the cloud. In that case, you typically connect with a hosting company specializing in Sage 100cloud for assistance with the cloud migration.
If you are using Windows Server 2008 R2 and wish to upgrade your server and stay on-premises then Microsoft has this guide to various different options available.
We always advise you adequately plan out your next upgrade so there are no surprises during your next Sage upgrade.