To use Exchange, you need to use one of two addons (OWL or EXQUILLA) or the freeware, DAVMAIL.

Thank you, David. I used OWL. The account was created. I created folders and transfered many email into them. Then the whole account disappeared from Thunderbird after I rebooted the laptop. When I tried to create a new EXCHANGE account, the message came up, "server already exists." I would like to still use Thunderbird but can't without an EXCHANGE account and I'm unable to create another one. Any suggestions? And I'd love to find the account that disappeared with all my emails in it! Any suggestions about that?

Hi Matt, I could not see or read your reply, thank you for trying. The only reply that showed up was David's from a couple of days ago.

Could you write your reply out to me in an email to either [edited from public forum] @gmail.com or [edited] @breathingcoachtucson.com (I'm able to get mail there on the ISP server) so I can read it?

Thank you.

Hi Matt, I could not see or read your reply, thank you for trying. The only reply that showed up was David's from a couple of days ago.

All I did was close your duplicate support request and point to this one should anyone want to find this topic.

Could you write your reply out to me in an email to either [edited from public forum] @gmail.com or [edited] @breathingcoachtucson.com (I'm able to get mail there on the ISP server) so I can read it?

No I try to keep replies to the forums.

But lets look at this issue.

That error is very clear. The server name already exists. This is in my experience generally an occurrence when people try to fix something that they do not like by adding the account a second or subsequent time. Just because you can not see your account in the folder pane does not mean it is not configured. Especially if there is any sort of update needed to owl following a Thunderbird or outlook update.

The first port of call when using OWL and you see an issue with an OWL managed account is to look at the download site to ensure you have the latest version. https://addons.thunderbird.net/en-US/thunderbird/addon/owl-for-exchange/

The Thunderbird add-on manager will often download an update because checking for update is one of it's functions, but it can not always install it without a restart of Thunderbird. So check the add-on manager that it is not awaiting a restart to install an update.

I then suggest you go to the more troubleshooting information on the help menu and look in the Mail and New Accounts section to see what account are configured.

I have included a small image of my info so you know what you are looking for. Extra points if you copy and paste your account information into the forum as a reply so someone like myself of David can see what accounts you have configured, instead of guessing.

If your account is still configured and is otherwise causing some issue, then the next step should be to contact the OWL support folks to see if they are aware of a similar problem. Historically they have been quite fast to reply to support requests, as well as getting update out if they are required.

Thank you very much, Matt. I'll try to follow your instructions and let you know and will post a screen shot too.

OK. I tried. I have OWL 1.2, which is the latest version. I could not find the troubleshooting information in the HELP menu in Thunderbird, and I did not see a HELP menu in OWL. I couldn't find anything that looked like the screen shot you so kindly provided. I also could not see how to contact OWL support.

Here is a screen shot of what the OWL page looks like. I hope you can enlarge it.

Yesterday I tried to create a zip file of the IMAP Thunderbird account but Windows could not open the zip file. Today I successfully created a zip file and it opens. Once I can create the Exchange account with my email address (steve.ross@breathingcoachtucson.com) which is the same email address as the IMAP account, maybe I can import the items in the zip file.

But Matt, I still am unable to find the EXCHANGE account I created days ago and which disappeared when I rebooted the laptop. And I don't seem to be able to create another one either. I'm still stuck and if you have time to continue helping me (untechnical as I am), I certainly appreciate it. Many thanks.