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Aside from the possible virus threat, instant messaging file transfer lets you and a friend or colleague work collaboratively on a document or share documents back and forth through one window. You can be involved in a conversation and send the file from the same Conversation window. There is no need to use a different window or program, and that makes life a lot easier. Keep in mind that Windows Messenger allows up to 10 concurrent file connections at any given time, and if you are using a firewall (even ICF), you must configure the firewall to allow the ICF file transfer traffic. See Firewall Configuration, page 223, for configuration details. When you want to transfer a file, simply choose the Send A File Or Photo link in the right pane of the Conversation window. A browse window appears so you can select the file that you want to send. The Conversation window in Figure 8-9 shows you the progress of the file transfer and whether the contact has accepted the file. By default, all files are transferred to %UserProfile%\My Documents\My Received Files. The environment variable %UserProfile% has a default value of C:\Documents and Settings\Username, where Username is your user Windows XP account name. You can open the file using the link provided in the Conversation window or by browsing the folder.

The other data protection issue to address with laptop computers is their logical security. Unlike desktop computers, which are protected from untrusted networks by firewalls and routers, laptop computers might be connected to untrusted networks on a regular basis. For example, a user might use the high-speed connection in her hotel room to create a virtual private network (VPN) connection to the corporate network. By doing this, the user creates a relatively unprotected, authenticated route to the corporate network from the Internet, not to mention she places the data stored locally on her laptop in danger. To prevent this situation, users can use personal firewall applications, such as Windows Firewall in Windows XP.

Securing mobile devices, such as devices running Windows Mobile 2003 (collectively known as SmartPhones), Pocket PCs, and Pocket PC Phone Edition devices, is similar to securing laptop computers Mobile devices should have user passwords to prevent unauthorized users and attackers from accessing them For example, Pocket PC 2002 supports both four-digit passwords and alphanumeric passwords for protecting access to the device Each time an incorrect password is attempted, a time delay is activated before the logon screen will reappear The delay increases exponentially upon each successive incorrect attempt In addition, if the mobile device will be connecting to the Internet or untrusted networks, such as public 80211b wireless networks, you should ensure that the device securely transmits authentication packets and data For example, Pocket PC 2002 supports connecting to Web sites that have Secure Sockets Layer (SSL) connections enabled and wireless networks that use WEP.

You can change the default location where received files are stored by clicking Tools, Options in the Windows Messenger window. Click the Preferences tab, and in the File Transfer section, change the path where files will be saved.

Although few viruses or Trojan horses resulting in significant damage that specifically attack the Pocket PC platform or other types of mobile devices have been reported, because these types of mobile devices are increasingly being connected to IP networks for long periods of time, as with laptop computers, you must install and maintain antivirus software on mobile devices and ensure that all security updates are applied as soon as they are released You might have certain users in your organization who have especially high security requirements, such as those needed to safeguard information that, if disclosed, could lead to the loss of life You should avoid storing any important information persistently on the laptops of these users You should also require these users to create a VPN connection to the corporate network and then use Terminal Services to connect to a computer on the network to access information.