I've kept tab on quite a few companies still using Nortel M1 and CS1000 equipment:
-Presence Resurrection Healthcare Chicago
-Amway Hotel Collection Grand Rapids, MI aka JW Marriott Amway Grand Plaza
-Spectrum Health Grand Rapids, MI
-Shoppers Drug Mart
-Hudson's Bay Company
-Saks Fifth Avenue
-Bon Ton Stores
-JCPenney
-Urban League of Chicago
-Community Healthcare System (Northwest Indiana)
-Seattle Fire Department (all facilities)
-Chicago Police Department Headquarters
-Los Angeles Emergency Management
-New York Times Newspaper
-Majority of CBS Owned Television Stations
-Disney
-Some ABC Stations (United States)
-Wegmans Grocery Stores
-Diocese of Chicago
-Franciscan St. Elizabeth Healthcare Centers (Lafayette, IN)
-Fed Ex
-Many Marriott Hotels
-Canadian National Railway
-The Toronto Star Newspaper
-The Montreal Gazette
-Lee Enterprises (News)
-The London Telegraph (London England)
-The Denver Post
-The National Hurricane Center
-The National Weather Service
-The Severe Storms Forecast Center
-Hilton Hotels (Not all hotels have Nortel, but many do such as the Wakiki Beach Hilton and Caribe Hilton in San Juan, PR)
-US Cellular Corporate
-Lake County Illinois County Government/Forest Preserve
-Riveria Maya Resorts
-Von Maur Department Stores
-San Francisco International Airport
-San Francisco Bart System
-Midwestern State University
-Valparaiso University
-Purdue University Memorial Union
-University of Illinois Union Hotel
-Microsoft (Some remote international offices still use Meridian 1 where failsafe communications is necessary)
-CVS Caremark Corporate Offices
-Masterbilt Refrigeration Products
-Grand Traverse Resorts/Turtle Creek Casinos Traverse City, MI
-Snoqualmie Casino Washington
-Lyric Opera of Chicago
-Hyatt Regency San Francisco
-Palmer House Hilton Chicago
-United States Postal Service
-Purdue University Meridian 1 Nodes tied into a SL-100/CS2100
-North Shore University Healthcare System Chicagoland
-Field Museum Chicago
-Shedd Aquarium Chicagao
-University of Michigan Hospital
-CenturyLink
-Best Buy Corporate
I am sure there are more. If I think of more, I'll add them later. Also, no guarantees every one of these companies still use Nortel phones....
Joseph Sus Jr. Nortel Emetrotel Consultant