Great, thanks for the info!
It will be need some work and some testing as you said cause we made some changes to Swift, but we'll take a look.
Regarding your issue, try searching for these lines in your php.ini and uncomment them (remove the leading '#'):
extension=php_imap.dll
extension=php_openssl.dll
The php_imap extension I think is not necessary, but my guess is that you don't have the other one enabled.
Regards.