- Boot viruses. The device is always booted, except when the battery runs out or a reboot is forced. Here the system runs a check which would prevent a boot with a boot type virus from occurring, but this is not for any security reasons, rather as a result of an integrity checking error.
- File viruses. The API developed for handhelds devices is in no way compatible with other systems’ APIs. Neither Symbian, Pocket PC nor PALM is capable of running software devised for platforms which are not specifically theirs.
- Macro viruses. Among its tools, Pocket PC includes by default a version of Word called “Pocket Word” and another in Excel called “Pocket Excel”. The transfer of information between the two removes any possible macros in the documents. Only macros produced with Excel 4.0 and stored in the same spreadsheet are maintained, but the Auto_Deactivate, Auto_Activate, Auto_Close and Auto_Open functions, which may contain risks in Excel 4.0, are not converted.
- Script Worms. Pocket PC does not include script interpreters, which means they cannot be run.
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