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kmail mail is a good product but lacks some features required in a business "world". First of all is missing the support for Microsoft Exchange protocol and then missing the integration with antivirus (for example clamav program). I know well that this tool is useless for Linux users, but some companies need this tool to help do not further spread the virus in own network.

Solution: implement the features required

As I understand it, the ability to interact with MS Exchange is well under way for the kde-pim akonadi version. As for virus control, clamav configuration does not rely on the mail client. It can be configured to scan mail folders at intervals, and there are tools for adding on-access scanning. Your distro's mailing list should be able to help you set that up.

As annew said, the exchange integration is well underway. Also, this is two ideas, not one. They should be in two separate threads. In the future please limit it to one idea per thread.