If your camera has been okay for that amount of time and all of a sudden outside photo color is not right, I'm wondering if you changed some settings. Your camera has white balance settings and this is where I'd look first. The reason I recommend this is because you say your inside photos are okay but not those taken outside.
Some digital cameras have a reset menu. If yours does, then reset. The camera settings return to their default (original factory settings).
If neither of these solve the problem, consider calling Olympus tech support to inquire if your digicam needs repair. If so, make sure the cost of repairing it is justified. With the way digital camera prices have dropped in recent years, sometimes it is more prudent and less expensive to buy a new one than pay to repair an old digicam.
Related reading:http://www.digicamhelp.com/white-balance/index.htm
