According to this blog post, Google plans to discontinue support of Chrome 53 or older with Gmail starting 2018. After the end of support, users using Chrome 53 or older will be redirected to a primitive version of Gmail using basic HTML. Since Slimjet 10 for XP is based on Chrome 50, it will be impacted by this decision of Google as well.
We believe for most users a basic html version of Gmail is actually sufficient. So there is no need to panic and ditch Gmail right now if you are a user of Slimjet for XP. Let’s wait and see how crippled the basic html version of Gmail will be before thinking about switching to a different email provider.