Now is this GMS2 with sp1 driving me crazy!

Our CEO, with a Nokia 9300i, are having trouble with the calendar sync.
Items won't sync and they are disappearing from the phone. In one case
they show up in WebPIM but after 30 minutes or so they disappear even
from there.
GMS 1 was working very well but the low level of supported devices
forced us to upgrade.

Upper managements trust in this software is very low right now. (even if
we have 25+ users that doesn't have this problems)

Are there any way to get support for this software?

Best regards