"Pam" posted the folowing article earlier this year:
I have read through this group and found this question several times, (that
word does not recognize stamps.com software) and the answers are always to
check with stamps.com help center.
I did, and would like to post their answer, as it took me a couple days to
get an answer back from them. I hope it helps somebody!
"To enable the plug-in for Microsoft Word:
1. Make sure Word is closed.
2. Log in to Stamps.com, and click on Help at the top of your Stamps.com
software.
3. Click on Download Plug-ins, and choose the Plug-ins tab at the top of the
next screen.
4. Place a check in the box next to your version of Microsoft Word, then
click Next.
The software will install the plug-in and may ask you to restart Stamps.com.
You should now see a Stamps.com icon in your Word toolbar.
This link provides step-by-step instructions on how to use Stamps.com with
Microsoft Office:
http://www.stamps.com/tools/microsoft/
There you will see exactly what to do, along with pictures of what the
software screens look like while performing these tasks.
Regards,
Customer Care Specialist
Stamps.com Internet Postage"
Peter Jamieson