you are blind

Actually, it is there, just not exactly how you might expect it to be.

There are 2 entries in the file menu. a Save and Save As for the current item in the solution explorer. So if you wanted to "save project as" you would first select the project in the solution explorer, then click the file menu, and the save as option will be to save the project as...

Of course this is only useful if you wanted to keep the original project file for some reason, and not just do a rename. Remember saving the project file as another name is not going to make a full copy of the project, it simply creates a second vbproj file.