I have a client who need Forefront TMG 2010 but I was advised by Microsoft to go for Forefront UAG 2010 instead, Can one use FastVue Reporting for Microsoft UAG 2010 since Forefront TMG has been deprecated.
Thanks for getting in touch. Unfortunately TMG Reporter only works with TMG, not UAG.
UAG will only perform the Reverse Proxy function of TMG. If you're looking for a full replacement, you might like to check out Sophos UTM (Forward/Outbound and Reverse Proxy, URL Filtering, Malware Scanning, IPS etc). http://www.sophos.com/en-us/products/unified-threat-management.aspx
We have also just launched Sophos Reporter as beta, which gives you TMG-Reporter-style reporting for Sophos UTM.