I am currently planning to migrate from Kerio Connect to Exchange 2010. From all of the articles I have read, the only way I have found to successfully migrate the user data is to save the users data to .pst, remove the KOF and account, attach to the Exchange server and re-import the .pst files. I have read that I can migrate each user's email/folders via IMAP, but this will not pull the user's contacts and calendars. From what I understand, this is due to Kerio calendars being in a WebDAV format. I am looking for any opinions or suggestions that anyone may have. Any opinions, precautions and/or tips are greatly appreciated.