Yes you can, below is an excert from OE Help:
Creating identities is a way for several people to use Outlook Express and the Address Book on the same computer. For example, you and a family member may share a computer. If you each create an identity, you would each see your own mail and your own contacts when you log on under your identity. Once your identity is created, you can organize your contacts the way you want them by creating subfolders.
Usually, you will create identities while you are using Outlook Express (or other applications that use identities). You can create identities from your Address Book only when you open your Address Book from the Start menu rather than from Outlook Express. To open Address Book from the Start menu, click Start, point to All Programs, point to Accessories, and then click Address Book.
Further info:
OE: Help > Index, enter "Identities"
M
