Fixed most of timezone problems on Exchange2007_SP1 (actually SP3)

Signed-off-by: Michel <info@1st-setup.nl>
Removed the exchange addressbook entry from the Preferences: Compose : Addressing : Directory servers list.
Will introduce an own selection on the EWS preferences page

Signed-off-by: Michel <info@1st-setup.nl>
Fixed problem when cloning a calendar which connects to a higher exchange server version than the new credentials and serverurl.

Signed-off-by: Michel Verbraak <michel@1st-setup.nl>
Merge branch 'master' into mail