We recently acquired a new company and are preparing to visit them and provide an Orientation session for all employees. We are very sensitive to their aprehension and want this to be a good experience for them. Our new employees are not unhappy to be joining us, but there is a fair amount of uncertainty.
I'm looking for any best practices, specicic to this situation. If anyone has experience delivering orientation to newly acquired employees please share your lessons learned.

SB-

I have done this 3 times over the past year (we are serial acquirers ) so I have some experience.
The key is remembering that this is not just orientation. It is part of a larger change management experience for the employees. In every session there needs to be clarity around new vision and the benefits to the acquired employees. Why are benefits better now? What additional resources do they have now? What new opportunities are available? and such.
When the new employees realize that it's not just about having to do things differently, but there is actually a benefit specific to them they tend to have an easier time swallowing it.
Make yourselves as available as possible for Q & A.
Hope this helps. Let me know if you have any specific questions.

Yes, it helps me to frame our message. Thank you. Please let me know if you have additional thoughts.

I agree with all that Dvsnhd99 said as we have done four aquisitions this year. One thing we have learned is to not make it a one time event. Do the first meeting, immediately follow up with a Q&A on a weekly basis and hold additional face to face meetings as needed.
Good luck!

There is a really good training program provided by Linkage on Managing Organizational Transitions and Individuals Transitions in Organizations. My organization is also going through a merger and this was the first "change management" program which I have seen which presents a holistic approach to transitions, and not change as a single event. It looks at changes and individual experiences and how that affects the person, team, leader and organization. You might want to check it out. (I swear I am not employed by Linkage or get any kickback even though that just sounded like a really hard sell - didn't it?)