JohnN

Thanks for your reply, Hazelnut. Yes, I did check the system requirements document you mentioned. Unfortunately it stops at Server 2008, which is not a current product. Windows Server 2011/2012 are not specifically addressed. I will try and contact Piriform directly, as you suggest.

Which versions of CCleaner can be used with a server running Windows Server 2012 Essentials or Windows Small Business Server 2011 Essentials? Thanks.

Dennis, Thank you very much for your prompt, helpful reply. I have one follow-up question, if you don't mind. Is this version of CCleaner also compatible with the even-more-ancient Windows 95? John

I am helping someone who has a Windows 98 SE computer. Could you please tell me what the last version of CCleaner is that supported Windows 98? Thanks very much.