First of all now that all my users are created and joined + mail box transfered, I have a lots of issue with a Brand install 2008 Std SP2 and Exchange 2010.
And I thought that could be one of my Main issue : Domain has an unknown Exchange signature.
Exemple of the issue ( cannot create another MailStorage, when I create a distribution group and I try to send a mail it says invalid email (does not exist )). etc..
and from the BPA it says that I need to do a domain prep to fix the : Domain has an unknown Exchange signature
NOW my question does domain prep on prod server worth ? meaning would I loose all my users settings, mailbox, profile etc.. ? Im scared a bit of doing a domain prep on my domain.
Would Domain prep will fixe my Issue, should I call microsoft for support ?
BTW: I have a over 60 users.