Why? Is it going to catch fire and explode?
If you haven't been using "more recent browsing technology such as Apple's Safari." , then you're not interested in changing things, so why do you need to change now?
Here's a decent reason: IE isn't getting updated to fix security holes. So, if someone comes up with a new hack (for example, some kind of web address spoofing scheme), Safari or Firefox users will probably get a quick fix, whereas IE users won't get notified a problem exists.
The one bad side of this: some idiotic websites are hard-coded to only work with IE. I know, I could turn on the "debug mode" of Safari, and set the "user-agent" variable to read like IE, but it is easier to just fire up IE for those few sites.