Hi. Thanks for reading this. I am a very intensive user of emal. I have hundreds of folders and thousands of saved emails in them, which are very important to my business. My business email account is an IMAP account on my own dedicated server with my own domain. I do not use my me.com email account except as my MM login. I have been having problems with Mail. In particular, SSL problems, but there are a few other things I am not wild about. The tech support guy at my web hosting company (Liquod Web) suggested that I change email clients, to Thunderbird. He says he has gotten a number of calls about the same problems I am experiencing with Mail (failing to recognize a new SSL certificate for example, or no way to clear old certificates). But has received no calls from people using Thunderbird. If I change email clients, will that screw me up with Mobile Me (and later, iCould)? If it is Ok fr me to change clients, would Thunderbird be the best choice or is Outlook equally OK? I have an iMac, iPad and just got iPhone 4S. Upgraded to Lion on the iMac. iPhone already has iOS5. iPad still on iOS4.