please suggest some books to learn exchange technical refernce

Here are a few (with SP1): http://www.amazon.com/Microsoft%C2%AE-Exchange-Server-2010-Inside/dp/0735640610/ref=sr_1_1?ie=UTF8&qid=1302892902&sr=8-1 http://www.amazon.com/Microsoft%C2%AE-Exchange-Server-Practices-Microsoft/dp/0735627193/ref=pd_bxgy_b_img_bTim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington

Hi, Besides the above, you can refer to the library of Technet: http://technet.microsoft.com/en-us/library/aa996058(EXCHG.80).aspx. If you have any question about Exchange, aks them to Exchange forum:http://social.technet.microsoft.com/Forums/en-US/category/exchangeserver Hope this helps. Thanks Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.