Zip Codes now include country code as part of the primary key.  A zip code needs the system record, in the address' country code, for it to be accepted by Sage 100.  Using 3 digit codes allows you to benefit from the Sage provided USA zip code list (and the Canada list of postal codes, if you chose to install them).

2-Digit country codes work in Sage 100, but a mix just makes things more confusing.  We generally recommend using 3-digit country codes (updating existing addresses, and removing the 2 digit country codes), to benefit from the Sage lists, but the choice is yours.

Zip Codes now include country code as part of the primary key.  A zip code needs the system record, in the address' country code, for it to be accepted by Sage 100.  Using 3 digit codes allows you to benefit from the Sage provided USA zip code list (and the Canada list of postal codes, if you chose to install them).

2-Digit country codes work in Sage 100, but a mix just makes things more confusing.  We generally recommend using 3-digit country codes (updating existing addresses, and removing the 2 digit country codes), to benefit from the Sage lists, but the choice is yours.

good morning, i didn't realize that it's possible to install the Canada list of postal codes! Thanks for the tip.

Yes, it is in the server install program, after the modules list, after the demo companies list.  No space in the middle of the postal codes, which is a bit unconventional, but you get used to it.