Assuming you mean local folders in WLM that you created-----------no. There is no way to export local folders from a desktop client like WLM to a webmail page like Comcast webmail. You might be able to copy/move the emails in those folders to other, IMAP folders though. Then, you could add the respective account to Comcast email under "Add email accounts" as an external account. Bit of a job but it should work.