Having used Outlook for over 20 years I have over 500 folders and thousands of emails. Is there a way to tell how many folders and emails I have? Can Thunderbird handle such a large import, maintain my folders and their hierarchy, and the maintain the emails stored in them? I use Pop3 and have about 30 email accounts. Is that an issue? Does Thunderbird import all of the account settings? Can I run both Thunderbird and Outlook simultaneously to determine if Thunderbird has imported everything and the migration is complete and fully functioning? I read someone had a problem importing because their Outlook was 32 bit versus 64. How do I tell if mine is one or the other? Do you know of any other import issues/problems?