Abhishek,
Suggesting the wrong answer twice does not help. Anyone familiar with the MS email program knows that the error message is coming from the MS email program. The answer is to reset the folder list, but it is hidden, no easy help to get there and your answer just confuses the issue even further. I chose to right click the account name in the folder list, not the actual folder. I then chose Show or Hide folders and clicked on Reset List. Fixed it exactly one second. Less time than it took to read one of your wrong answers.