I have upgraded from 2003 to 2010 in Exchange. I am currently ahving issues with users inside the building having no issues connecting to the Exchange server, but on the outside we are having issues with retrieving mail. The mobile device will authenticate with the AD and set the account up the throws the error of cannot get mail unable to reach server.
We have a sonicwall here that I am leaning towards is causing the issue. But cannot be positive yet.
Has anyone seen this before?