March 7 2005
Q: When I am typing an email, all of a sudden my cursor starts to overwrite what I previously typed.  What happened and how do I make it stop?
A: When you were typing, you must have pressed the Insert key.  This invoked an old computer feature-Overtype.  To remedy this all you need to do is press the INSERT key again and this feature will turn-off.

This applies to other programs like Word, Excel, etc.