Just found this on C|NET - Obama appears to be an e-mail addict (aren't we all!) and doesn't want to give up his Blackberry.
<snip from C|NET article>One reason to curb presidential BlackBerrying is the possibility of eavesdropping by hackers and other digital snoops. While Research In Motion offers encryption, the U.S. government has stricter requirements for communications security.
Fortunately for an enthusiastic e-mailer-in-chief, some handheld devices have been officially blessed as secure enough to handle even classified documents, e-mail, and Web browsing.</snip from C|NET article>
One is General Dynamics' Sectera Edge, a combination phone-PDA that's been certified by the National Security Agency as being acceptable for Top Secret voice communications and Secret e-mail and Web sites. The Sectera runs a mobile version of Microsoft Windows (mikehall: Windows CE), including versions of Word, Excel, PowerPoint, and Windows Media Player. The NSA claims that the installed versions of Internet Explorer, WordPad, and Windows Messenger are good enough for data that's classified at a level of Secret.
Check out the device photo on the C|NET site, you can clearly make out the IE, Windows Media Player logos.