Hi there and welcome
To do this,
On the Standard toolbar, click Address Book
TIP: You can also open the Address Book by clicking Address Book on the Tools menu.
Click Tools, and then click Options.
NOTE: If you open the Address Book from an open message, the Tools menu is not available. The Address Book must be opened by either method described above
In the Show this address list first box, click the name of the address book that you want.
Click OK, and then close the Address Book.
It will then be set as the default
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
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