When using Microsoft Word, I can write € by pressing ALT and holding it down while I enter 0128 on the numeric pad on the right side of the keyboard. When I try this while writing an AOL e-mail, I don't get €, but some other character. How can write € in an email?

Normally on outlook, yahoo etc. Alt+0128 will give you the € symbol. I think the below link will give you more information.

Microsoft Typography - euro Currency Symbol FAQ (http://www.microsoft.com/typography/EuroSymbolFAQ.mspx)

In Windows, You can always open character map and copy it from there.

You might be using a font that doesn't have the euro symbol in it's character map.

Press the Alt key. Continue pressing it while you type in 0128. Then release the Alt key. This will give you the € symbol. [This is usually abbreviated as Alt +0128.]

Fort the cent (¢) symbol, you type in Alt + 0162.

For the Pound (£) symbol, you type in Alt + 0163.

For the universal currency symbol, you type in Alt + 0164.

For the Yen (¥) symbol, you type in Alt + 0165.

For the Indian Rupee (₹) symbol, you type in Alt + 8377 [If this does not work on the PC, then you will need an update to Windows, or you can type it in Word 2010, OneNote 2010, or Outlook 2010 (but not in Notepad or Excel) and then select, copy and paste it into your document.]

The euro and rupee are part of the Unicode symbol set and so won't necessarily work in applications that don't recognize Unicode characters.

Luckily, recent versions of Microsoft products, e.g. Word 2010 etc, tend to work with Unicode, but older-style text applications may be using a different character encoding. If you can get Notepad to open a file using a unicode character encoding (e.g. UTF-8 or UTF-16) then you may be able to see the euro or rupee symbols.

If you develop web pages that may have the euro symbol, you should specify the character encoding as UTF-8.