How do I know which fonts are proportional and which ones are fixed width?

I didn't see any rules of a FAQ for posting, so please direct me to them if
i'm in error...
I'm trying to find out if there is a way to arrange archived mail without it
defaulting to all my mail.  For example:

Our os is windows xp prof. edition. Also we are using office XP. And my
question is pertaining to Outlook express.
In our office we have set up a mail server. There are several users in it.
While sending or receiving messages from any user or to any user, a copy

If I go to Tools>Options>Read>Fonts, there are Proportional and Fixed Width Fonts.
There are over 30 choices for the Proportional font but only 3 for the Fixed Width Font.
Can I add more fonts to the latter?
Advice appreciated.

I have OE on my XP pro machine. I have the latest norton antivirus
definitions and completed a full scan without anything found. I am receiving
massive emails saying "undeliverable" and then at the same time my machine
is sending out messages. I see them in my sent folder. Any ...

I use OE6 for e-mails and newsgroups.
Can someone kindly tell me the pros and cons of using HTML or Plain Text?
Also "message format"; should I choose MIME or Uuencode?
Thanks,

i found the outlook development center, but it looks like that is for office
outlook.
where can i find resources so i can develop for oe6
thank you

XP SP2 Pro OE6 IE6
All of a sudden I have a "new Identity" along with my created identities. I
cannot delete, remove it nothing works to get rid of it. . Have no idea
where it came from. Have tried deleting it, accounts etc still shows up.

How do I stop my email address from showing up in the properties section of
messages that I post in discussion groups? I'm using Outlook Express 6.

One of our Senior Group would like to create a signature in Outlook Express
and I can't find the way to advise her as to do what she would like to do.
She had the default Font in OE set to Arial 10, but she wants to create a
signature in Script MT Bold, size 14 and have that in OE ...

Toshiba laptop running XP pro connected to ADSL with inbuilt network card.
Good connection with no problems browsing any sites.
Good connection to mail server with Outlook Express & is setup to go
directly to inbox on opening & also send/receive.

When using OS Windows XP Pro and Outlook Express is there a way of
stopping the Windows Messanger Icon appearing on the task bar at the
bottom of the screen when Outlook Express is in use?
pq

I need to import (or export) my OE address book from one network computer to
another.
How do I do this? What is the file name and location where it is stored?
Thanks in advance.

I'm running Win98 with latest updates.  I use OE 6.0.
I want to backup my old emails stored in various folders so and can remove
them from my hard drive thereby freeing up HD space.
Is this possible, and how do I do it if it is?

As I still cannot issue a reply to posts, I have to answer by a new post.
Here are the answers to Bruce Hagen and PA Bear.
I compacted the folders according to the procedure set forth ("Offline", top
folder...). It took a few minutes and completed aparently without problem.