There have been some errors with Thunderbird, but so far all to do with the options. There are almost too many options, and I at least, have not found them easy to understand, or even to find.
forwarding an email gave a send error, but it was because remote data was not enabled.
I am now convinced that WLM has been the cause, and we have been trouble free for a couple of weeks now.with minor setup problems.
Thank to you and Gondola for your help, the forum has been a hugely helpful resource
Gondola, I wrote a longer reply, but because I was not logged in, I immediately lost it ****!!!@@@
I am a slow learner.
After a lot of hard work, I have transferred all our email folder structure, and contact lists to Tbird, and as you say, we are coming to terms with its look and feel.
I shall be glad if our expeience with WLM can help anyone, it was confusing that most of the time it worked, and then it would go into a sulk and refuse to send emails. It is a great relief to be able to send emails reliably again, you do get to rely on it.
Thanks again, and good night!!