Can u give me some idea that i can install exchange server 2003 & exchange server 2007 on a single machine for test lab & install all clients on single machine so that i can do all research,all practicals on sinle PC at home or any virtual pc is required.

you can use the Microsoft virtual PC 2005 r2 for creating machine & for that u need to have a good RAM & processor too. U can create as many machines as u can and test them. u can even find the vhd from Microsoft also. Ripu Daman Mina

Hi,Please refer to the article below to check if you can deploy virtual machine for test purpose. Microsoft Support Policies and Recommendations for Exchange Servers in Hardware Virtualization Environmentshttp://technet.microsoft.com/en-us/library/cc794548(EXCHG.80).aspx Regards,Xiu<!---->

how much RAM & CPU is required

Hi,I recommend you to check the requirment for Exchange 2007 and Excahange 2003, and then decide the requirment for your Virtual server.From the article below, we can find the Processor and Memory requirement for exchange 2007 and exchange 2003. Exchange 2007 System Requirementshttp://technet.microsoft.com/en-us/library/aa996719(EXCHG.80).aspx System Requirements for Exchange Server 2003<!----> http://technet.microsoft.com/en-us/library/cc164322(EXCHG.65).aspxRegards,Xiu<!---->

Thanks for replyCan u tell me how i can troubleshoot mail flow problems. if mails are not receiving and not delevering the mails what should i do to troubleshoot the problem within couple of minutes in exchange server 2003 and exchange server 2007.