Up through version 11.0, there is no way built in to ALM/QC to send an email to all the users.
You have a couple of options.
Write a program that will allow you to enter the content of your message, then use the SA API to get the email addresses of all the users, then use existing mail services to send the email.
Another option is to use a query to extract the email addresses of all the users, then paste that into your email message that you've created using your standard email application.
You have a couple of options.
Write a program that will allow you to enter the content of your message, then use the SA API to get the email addresses of all the users, then use existing mail services to send the email.
Another option is to use a query to extract the email addresses of all the users, then paste that into your email message that you've created using your standard email application.