Arvind,
THANK YOU! I followed your workaround instructions and found a PDF file from back in May in the SendMail folder that you instruct to delete. I assume this "stuck" attachment file is what was causing this issue to occur because after deleting the SendMail folder I am (so far) not experiencing the usual application freezing/crashing while in Preferences or after pressing the send file icon to attach the file to an email in Outlook.
One thing I do notice is that if I'm in Preferences and click the "Email Accounts" category on the left, the entire application crashes and brings up a Crash Report that can be sent to Adobe. Since the send file feature is working correctly this isn't a big deal at this point, but obviously something still isn't right there.
Thank you again for posting this information and I hope Acrobat phone support are also aware of this workaround to save other customers from wasting valuable time re-creating user profiles and/or re-installing operating systems just to resolve this issue.