I have a client with Thunderbird as an email program. TB is extremly slow, the progess circle spins for 3-5 min befor the program can be used. I have run Spyware and virus scans and the system is clean. I have deleted the inbox in the TB user folder, it recreated itself and still it's slow.

Can you not use OE or Outlook?

You should post this question on the Mozilla Thunderbird forum not here. Thunderbird support forum Personnely I would rather wait 3-5 minute then use that Outlook or OE but then I do not want spyware and trojan installed on my computer. Never say Never Romeo Void Firefox 1.0.7 A Safer Browser Thunderbird 1.0.7

'Personnely I would rather wait 3-5 minute then use that Outlook or OE but then I do not want spyware and trojan installed on my computer.'- so what then, you dont use anything?

I had the same problem. I finally, by accident, found the problem by un-installing A3S Firewall. Bingo every is normal. Prior T-Bird & Firefox would be reeaalll slow coming up and using 90-97% of the CPU. Now I have Comodo Firewall and all is well. If you don't have A3S then shutdown your firewall. It might help you diagnose the problem.