I have a AEG built-in microwave oven that im trying to uninstall from the cabinet but cant seem to find the means to remove the mounting frame that is fixed to the face of the kitchen cabinet.

No! The frame in a conventional microwave oven is not built to support the weight.

Remove a GE Spacemaker
The GE Spacemaker series of microwave ovens are designed to be installed above an oven range, freeing up counter space in your kitchen. Some of these Spacemaker models are connected to an outside venting system to carry kitchen vapor and odors outside. Other Spacemaker models utilize a ductless system to do this. Removing a GE Spacemaker microwave oven isn't a difficult task, but, because of the size of some of the oven models, it is a two-man operation. Have a question? Get an answer from an appliance repair specialist now!

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Things You'll Need

• Assistant
• Sharp knife

• Phillips screwdriver

Instructions

1. • 1 Open the cabinet above where the Spacemaker microwave oven is installed. If you see a vent in the cabinet leading to the Spacemaker oven below, your Spacemaker is vented. This vent needs to be disconnected before continuing with removal. Disconnect the vent either by loosening the duct clamps or by cutting the duct tape away with a sharp knife. Pull the vent out of the top of the oven.
     
   • 2 Have an assistant support the oven from below. Loosen the mounting screws connected to the Spacemaker through the cabinet bottom. Loosen the screws by turning counterclockwise with the Phillips screwdriver.
     
   • 3 Unplug the Spacemaker from the socket in the cabinet.
     
   • 4 Continue loosening the screws while your assistant holds the oven in place. Once the screws are removed, have your assistant slowly lower the Spacemaker down by lowering the front face at a 45-degree angle.
     
   • 5 Feed the power cable for the Spacemaker through the hole in the bottom in the supporting cabinet.
     
   • 6 Help your assistant slowly pull the Spacemaker forward and out of the mounting brackets on the rear wall. Once the Spacemaker is cleared of the mounting cabinet and rear wall, set it down.
     
   • 7 Remove the mounting bracket from the rear wall by loosening the screws.
     

Read more : http://www.ehow.com/how_7344250_remove-ge-spacemaker.html

Look for back mounting bolts location, find your wall studs location and mount from the back

If this is a built in mounted under an overhead cabinet, Just open the above cabinets and there will be 2 long screws facing downward that hold it in place, if it is a built in that is framed in then you will need to remove the frame and the brackets behind the frame that are holding it in place and then slide it out.

IS THERE A PLATE HOOKED TO THE WALL IT IS RESTING ON. TRY PUSHING UP THEN OUT. IF THERE IS A CABINET ABOVE IT YOU MAY HAVE TO LOOSEN IT ALSO

Sometimes older microwave ovens are built into the walls and are attached to the studs and mountings already in the house with cabinets built around them. Try taking off the paneling of your cabinets a little at a time until you can see how the microwave is attached. With any luck, it's held in by brackets underneath the cabinets and not attached to the studs in the walls.

Good luck!

Usually the screws are on the side behind the door so you must first open it. If your oven fits well and does not move it is possible that there are no screws.

Hi Brunie1,
They are on popers so with a knife being careful not to bend either knife or surround gently prise 2 strips either side of door. this should then reveal the 4 screws

You did not note your Make and Model. As there are many different types, all I can give you are basic directions.
First make sure the Power Cord is UN-PLUGGED from the wall.

1. Remove the Top Vent Grille Cover. There are screws holding this on, either Three you can see (one on each side and one in the center), or Open the Door and look for screws at the top of the Frame that go Up Into the grille.
2. Look in cabinet above unit for screws that hold unit up. Usually two (one on each side, front), can be more. Remove.
3. Look where Top Vent Grille Cover was removed. There should be a Long Screw or Screw-Type Lock at each( top) corner. These hold the unit tight on the Wall-Mount Plate. Remove. You should have HELP at this point as you will slide the unit forward until it comes clear of the Support Arms.
GOOD LUCK!!