another little gem I find pretty useful.. yes.. I hate full screen RDP..

Create a remote desktop connection and save the profile. It makes a file with an .rdp extension. This file is just a text file, so now open it in notepad. The first few lines should look something like this:

    screen mode id:i:1
    desktopwidth:i:1015
    desktopheight:i:715
    session bpp:i:16
    winposstr:s:0,3,0,0,1015,725

http://www.kudzuworld.com/blogs/Tech/2006_07_10_A.en.aspx

Personally, I prefer the one given in the comments… use the height and width flag in the command prompt…

an other approach is to use the command line switches /w:width and /h:height of mstsc.exe. so in your case it would read mstsc.exe /w:1015 /h:715 more command line options can be found using mstsc.exe /?

so thank you chad and martin ..