We will continue to support both versions for some time to come as users need time to migrate. The main drivers are VIN decoding, integrated email and additional catalogs. The feature set of the legacy 5.9 version will remain what it is today and the new development efforts will focus on SE.
By watching the forum you can keep up with our progress and decide to upgrade at a future date that makes sense to you.
EDIT: I believe the initial question was emailing from the current version; you can with a free 3rd party software that works with your Print or Fax button: http://m1faqs.com/knowledgemanager/ques ... tionid=100
A number of shops here have been using it for 3-5 years.