mails sent to exchange inbox getting to deleted items, where its creating inbox and residing over there. Why this happens, i checked for any rules found none. auto archiving not enabled, any idea?

What version of Exchange? Make sure the calendar settings for that mailbox are set to AutomateProcessing:AutoUpdate if its not a resource mailbox. 2007: http://technet.microsoft.com/en-us/library/aa996340(EXCHG.80).aspx 2010: http://technet.microsoft.com/en-us/library/dd335046.aspx

its exchange 2007 sp2 rollup 4... this issue happens with general emails not specific to calendar items...

its exchange 2007 sp2 rollup 4... this issue happens with general emails not specific to calendar items... If the automateprocessing is set incorrectly, it will effect all messages, not just calendar items.