AddressBlock is a mailmerge field associated with an attached data file. If
you are not using a merge document with a data file attached the field is
not available. The field doesn't 'store' anything.
I suspect that you want 'Address Book' which is not on the mailings tab, but
can be added to the QAT to insert addresses from Outlook.

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> I have a blank page and typing a letter, I want to insert something
> stored in the address block under the mailings tab. when I click the
> mailings tab, the address button is not bold so that I can click it
> to open it...WHY?????