While viruses for Symbian and Windows Mobile currently seem more like proof-of-concept studies, the Windows Mobile platform offers malware writers who already know Windows a very similar environment. Some may call it a hype, but that's what people said about spyware 5 years ago as well, and our opinion is that it's better to protect yourself before something happens than to do it afterwards. Spybot-S&D for Windows Mobile uses a lightweight version of the detection engine of Spybot-S&D for Windows to detect threats for Windows Mobile and Symbian both, the later because Bluetooth worms could spread over OS borders, and while they would not perform on an incompatible OS, they would still waste precious space on the device. Installation instructions:
Please download the version for your device (there are different version for Pocket PCs and Smartphones), then copy the file to your device through ActiveSync. Open the devices file manager and click on the file, and the installation will start. After the installation, you should have a Spybot-S&D icon in your programs group. For Smartphones users, please download the software here (903 KB). Update Description:
The current application version is 0.3, using engine version 1.5. Spybot-S&D for Windows Mobile is compatible to Pocket PCs and Smartphones running Windows CE 3.0 (Pocket PC 2002) up to the current Windows Mobile; there are separate downloads for the Pocket PC and the Smartphone version available.
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the Spybot - Search & Destroy for Windows Mobile v0.3 free for Pocket PC (2.63 MB)

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Download Spybot - Search & Destroy for Windows Mobile v0.3 direct on your windows mobile phone