I was looking to purchase MS Office 2019 for Mac from them and wanted to verify that they were selling genuine products prior to my purchase. Rang Microsoft to find out and they were not very helpful at all directing me to their website for a purchase and telling me that "Certified Microsoft Partner" is not something that exists.
Spoke to someone form Softwaredepot, who assured me that they are selling genuine MS products. Was told that they have a verification link on their website, but it just happened to not work at the moment - none of this instilled a great deal of confidence in me. However, the guy offered to stay on the phone with me whilst I was ringing Microsoft to verify the authenticity of the key - after I made the purchase (he'd reassured me that he would remain on the phone call with me until all my doubts would be cleared up, otherwise he would refund the money). Sure enough, the MS agent verified the authenticity of the key, and I'm now installing the package hoping it will work. However, I was impressed with Softwaredepot's agent.