If, however, you are less concerned with format, and just want a plain email starter, you can actually create a Windows shortcut that will generate an email message for you, complete with recipients, a subject line, and a basic body.  Start by opening Notepad.  Once you're in, type the following, replacing the data in { } with the suggested fields:

Keep the following in mind:

• No line breaks, keep it all on one line (don't hit the enter key)
• Multiple email addresses can be specified by separating them with commas
• Some versions of Windows do not recognize spaces within the shortcut, so if you have issues, replace your spaces with the phrase: %20
• Some versions of Windows will not let you edit the target line once the shortcut is created.  Save your notepad file somewhere safe if you want to edit it later.

Next, copy the text only to the clipboard.  Go to where you want your shortcut, and follow the steps to create a new shortcut, pasting your text in where it asks for the location of the item.  Name it what you want.  When you double click it, a new email message will be created and made available for you to edit. 

So, once supported and/or enabled, all you need to do is change your USB keychain drive from the static file holder that it is, to a bootable disk, similar to a standard bootable floppy or CD-ROM.  There are numerous ways to do this, many of which are easily Googled, or you can look at purchasing a shareware product such as FlashBoot which can create / transfer bootable disk images to USB quickly.

Click for larger image

Further reading:

• Microsoft: Recommendations for Booting Windows from USB Storage Devices