A family of Microsoft word processing software products for creating web, email, and print documents.
The truth is that the USPS switched from Postnet to Intelligent Mail in 2009 (although Postnet was supported until January of 2013). For some factual information on why Microsoft no longer includes Postnet Bar Codes please see:
The POSTNET **bar** **code** that Word generates no longer...
Your best source for current policy is the USPS, itself. I'm not sure of your need, but many don't realize that bar codes are intended for bulk mailing automation pricing purposes, not individual correspondence. Unless you do a significant amount of monthly billing, advertising, etc. it well may not be worth investing in the new system... It's my understanding that any mail not presented to the Post Office as part of a qualified bulk mailing isn't even scanned for a code.