I am trying to use this product for work purposes
The EULA for Home Premium (and I expect University as well) specifically
excludes use for business use.
when I try to open my documents, it says that it is unlicensed
Is this a new computer? If so then check to see whether it came with a TRIAL version of Office. If it did then uninstall ALL instances of Office, re-boot and re-install your paid-for version.
when I try to log into my email associated with this product, it says this email is not associated with microsoft products. Any suggestions??
What do you mean by "log into my email"? Where are you doing this, and is this the SAME email you used to purchase the product or a different one?