I'm offering help, not asking for it. Someone had asked long ago, and the answer provided by support was incomplete. EM Client is a much touted but terrible, problem ridden, email client, the useful version of which costs about $50. Among the many problems, email and settings are stored in database files that are very prone to corruption. I mean that it took my email three days from install to corrupt. The person who posted several years ago will certainly NOT be the last person migrating to tried and true Thunderbird. To export from EM Client, one first of all needs it working. If you are a pro user they MIGHT provide support, when they get to it, and if various conditions exist, and if no other software like a Windows update played a role in corrupting the file. Lots of conditions there. Email is exported from EM Client in eml format. Same as Windows Live Mail. Then you would follow the procedures to import email that is in eml format. I'm reviewing that myself, but either directly or after some manipulation Thunderbird does import email in eml format. Then it stores it in a format similar to EM Client. Not good. But I've never seen it become corrupt in the years I previously used Thunderbird. Importing nested folders might not be a straightforward matter; I'm not sure. Now, the good news is that, in my case, only the top levels of the complex EM Client database was corrupt, so when I moved the files to a folder and restarted EM Client and pointed it to the folder for the store folder it restored the database and all was well, and others have reported that fixing EM Client database corruption is often that simple. I don't know about a way to import settings, but setting up email accounts is easier in Thunderbird than in EM Client. I just needed to enter name, email address and password, for each account, and, voila, I even get my Yahoo email! I've NEVER seen THAT prove seamless and consistent before!