Indeed Microsoft does call it "speech recognition"not "voice recognition"
some background explaining the difference in the terms:
http://en.wikipedia.org/wiki/Speech_recognition
http://en.wikipedia.org/wiki/Voice_recognition
TalkIt TypeIt
http://tinyurl.com/263lj7
Naturally Speaking
http://www.nuance.com/naturallyspeaking/
Vista
http://tinyurl.com/2zzdmv
XP
http://tinyurl.com/2233d
from Help in Word 2003
Install and train speech recognition
This feature is available in the Simplified Chinese, Traditional Chinese, English (U.S.), and Japanese language versions of Microsoft Office.
Speech recognition is installed in all Office programs by initially using the feature in Microsoft Word, or by doing a custom installation.
After speech recognition is installed, you can increase speech recognition accuracy by taking a few minutes to train the computer to recognize how you speak by reading aloud prepared training text.
Install and train speech recognition through Word
Open Word.
On the Tools menu, click Speech.
You're asked if you want to install the feature. Click Yes.
After the installation is complete, click Next to train speech recognition.
Training begins with help in adjusting your microphone.
Notes
After speech recognition is installed, it is available on the Tools menu in all Office programs.
If you do not train after you install speech recognition, you can train by clicking Tools on the Language bar, and then clicking Training.
You can get help adjusting your microphone by clicking Tools on the Language bar, clicking Options, and then clicking Configure Microphone.
Install and train by doing a custom installation
On the Microsoft Windows Control Panel, double-click Add/Remove Programs.
Click Change or Remove Programs, select Office 2003, and then click Change.
Click Add or Remove Features, and then click Next.
Select the Choose advanced customization of applications check box, and then click Next.
Under Choose update options for applications and tools, next to Office Shared Features, click .
Next to Alternative User Input, click , click Speech, and then select the type of installation you want.
Click Update.
Follow these steps to train speech recognition the first time you use speech in an Office program.
In most Office programs, click Speech on the Tools menu.
Note In Microsoft Excel, point to Speech on the Tools menu, and then click Speech Recognition.
To train speech recognition, click Next.
Training begins with help in adjusting your microphone.
Notes
After speech recognition is installed, it is available on the Tools menu in all Office programs.
If you do not train at this point, you can train by clicking Tools on the Language bar, and then clicking Training.
You can get help adjusting your microphone by clicking Tools on the Language bar, clicking Options, and then clicking Configure Microphone.
