It's much better then WHMCS's MailChimp module. It's work very well! I think it's the one of most good module.
They don't resell Microsoft products anymore.
Thank you for your feedback, however, we do still sell Microsoft CSP products to resellers and will continue to do so. I see from your sign up with us that your company is operating in Azerbaijan. As you may have read on the module page, or the download page, and as our account team communicated with you, we cannot support CSP Indirect Resellers from your country. We can support CSP Direct Bill Partners from the entire world, however, that would require your company to become a CSP Direct Partner with Microsoft itself first. Or, you could use the Microsoft Indirect Provider tool https://partner.microsoft.com/en-us/cloud-solution-provider/find-a-provider to find an Indirect Provider that can support Indirect Resellers in Azerbaijan. We hope that helps.