1) Have you found it fairly easy to use and fairly stable (meaning that it seems to work 95% of the time on the machines on which its installed)? Our installs are on mostly XP machines.Yes.
2) Have you run into issues with XP users who are not admins on their machines?No.
3) What recommendations do you have regarding using or not using CDOSys?It is the only mechanism I have used for years now and I recommend it highly.
4) One of our programs produces statements for our members and pumps out emails with the statements as attachments. Many smtp servers don't like a high number of connections in a short period of time. wwIPStuff allowed us to get around this by creating a Handle that maintains the connection with the server so multiple emails can be sent through one connection. Can the same be done via CDOSys?Yes.
If you have a copy of
MegaFox: 1002 Things You Wanted to Know About Extending VFP chapter 4 has all kinds of info anout CDO and a sample class and form. The class has a couple of minor bugs in it - if you use it as a basis for your class, you need to delete all the attachments before you process each message.