Comment 13 for bug 1458593

I recently moved a customer over to Google Apps for Business with Thunderbird. After adding Lightning, they started complaining about the speed. We disabled Lightning (literally, the disable button) and the speed issues were resolved. Of course, they need their calendar. So, we enabled the 30 day premier trial, and added the Google Apps sync for Outlook to their computers, and all is well. This stinks. I want to advocate for open source, but this makes Thunderbird an unbearable replacement for Outlook. I know Thunderbird on its own isn't meant to compete directly, but I wish there was a really good replacement for Outlook on Windows.