Moving SharePoint Users Between Groups

How do I move users between groups?

I see this question a lot on forums and have been frustrated myself.   The solutions out there are mostly programmatically moving users between groups or copying them one by one, or better yet - create an AD group and use that to manage your group.

A simple answer is right on the rights page.   Just select all the users you want to move, and then go to Actions / E-mail users:

Now you have unique names you can cut and paste into the new group, already semi-colon delimited and guaranteed to be unique.   

Limitations

Unfortunately, there are limits - only 20 users at a time seem to be all I can create using this method.  Explanations differ on why this is true, but I have not found a workaround.

There are also limits built into the mailto function used by SharePoint  -  2083 character length:

function BtnEmailClick(viewId)
       {ULSJyi:; var emails = GetSelectedUsers(viewId, "email", ";");
   if (emails.length == 0) {
  alert(noUserEmailSelectedMsg); return false; }
  emails = "mailto:" + escapeProperly(emails);
  if (emails.length > 2083) { alert(tooManyUserEmailSelectedMsg); return false; } window.location =   emails; return false; }

So for really long lists - either rinse and repeat for every 20 users, or go the programmatic way.