Can WLC be upgraded from 3.2.78.0 directly to 4.0.179.11?

Hi All,
I have read some release notes and Configuration guide but they all didn't tell me the detail. Actually I want to know can I directly upgrade the WLC from old 3.2 version to the newest 4.0 version? And will the existing configuration be kept after the upgrade? Anyone can help me? Thanks!
Jason,
Thanks

FYI:
If you are also planning on upgrading your WCS (if you have one), you will find some helpful information on an earlier thread:
http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=Security%20and%20Network%20Management&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1ddcbc4c
In the case of the WCS, you are forced to perform an uninstall of 3.2 software and an install from scratch of 4.0. We did the upgrade prior to performing any configuration in 3.2 and so did not attempt to carry forward the config. But you will have some "fun" bringing any AP licensing forward.
- John

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