Windows users not seeing my attachments, and other issues

Question

After being an Entourage users for years, I finally switched to Mail/Address Book/iCal/.mac combo when Leopard came out. After using Mail for a few weeks, I have some questions:
1. In Entourage, I could paste an image from the Clipboard (say, a screenshot via Command-Shift-Control-4) into a message, and everyone could see it. When I do that now, none of my Windows friends can see the image. All they get is a blank box with a red x in it. What are the methods in Mail that work for sending attachments?
2. If I get an email from someone, I want to know if they're already in my Address Book. Is there a way to do that? If I right-click on the person's email address, a drop down says "Add to..." and it will add them, even if they're already in my Address Book, which leads to duplicates and even triplicates. I find myself duplicating contacts virtually every day. In Entourage, if you clicked "Add to Address Book" and it that person was already in the Address book, it would toss up a window, saying that this address was already in there, do you want to view it, or add to existing contact.
3. No categories. If I get an email from someone that treats me with familiarity, but I don't recognize them, there's no way to go into my address book and tell what relationship I have with that contact. Client? Acquaintence? Purchaser? Relative I only met once 6 years ago? This is because there seems to be no way to attach a category to each contact. Once you have over 2000 contacts, it becomes difficult to remember what each one is there for. Did they purchase a product on my site? Or are they a vendor? Someone I met at a party? There is the Mail Group function, but those act more like Smart folders. But those groups aren't attached to the actual contact, so when viewing the All Contacts, there's no way of telling who's who. Even if there were simply a way to color each contact, those colors could act as a category, and one could sort by them. This is my major concern right now with Mail over Entourage. Any ideas on how you are handling this?
4. There doesn't seem to be any way to grab the entire mailing address in one Copy. You can highlight/copy the address, street and zip, and paste that into, for instance, a Dymo label, but you have to go back and grab the name separately. Any way to completely grab the mailing contact information?
5. If I search for, say, "Comcast" in the Address Book, I logically get all of the contacts that have "comcast.com" in their email address. But there should be a way where it gives precedent to the actual Comcast company contact, instead of having to scroll through hundreds of contacts to find the actual company. I'm finding this for many companies that happen to also have their name in the Notes section of many contacts. I guess I don't have a question on this point, just pointing out something.
Thanks for any tips.

Answer 1

It would help us help you if you posted the URL to the html file that holds the QuickTime file.
A QT MPEG-4 file should be viewable on a Mac or PC running QuickTime version 6, or higher. A 36 minute movie that is not set to "fast start" would require the entire file be downloaded prior to playback and that would take a few hours over my pitiful Texas dial-up connection.