hello guys, i have a question about yammer for example, if i sighn up in yammer with a company mail like microsoft , can i access to all of employeers of micros

hello guys, i have a question about yammer for example, if i sighn up in yammer with a company mail like microsoft , can i access to all of employeers of microsoft or no ,i was accessing to microsoft's employeers that sighned up in yammer?