is it possible to write a webapp that can download mails from exchange server 2007

It does not matter what programming language. C开发者_JAVA百科an anyone please give me an idea if this is possible and any tools or API's available please?

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Given that you used the imap tag, I'm assuming that means that you have IMAP access to the server. In that case, then yes. There are several third-party components available that provide IMAP access in .NET code. I have personally used RebEx Secure Mail for .NET, and they provide a trial period where you can try it out and see if it will work for your purposes. There's also a fairly helpful help site.

For something free, try this: http://interimap.codeplex.com/