Will I lose any email during the transition – will there be any downtime and how long will the conversion to Nmail take for my email box?
There will not be any downtime experienced during the email migration. The Google g-mail accounts will be turned on July 22nd and can be immediately used to send and receive email.
the Exchange Email Application will be locked at the exact same time so that employees do not inadvertently access their old Exchange email account and attempt to email from it.
No email will be lost during the transition. A copy of your inbox (this includes your 'inbox' folder and all other folders which have been created and reside on the Exchange Server) will be made and the email migrated from Exchange to Google. All emails in your inbox present at the beginning of the migration (July 22nd) will be present after migration has completed in the event that an migration problem occurs. Email in your exchange inbox present as of July 22nd will not be undelete until such time as the Exchange Email application server is shutdown and reconditioned for a future application installation. The target date for the Exchange Email Application server to be shutdown is October of 2013.
It is expected that the transition will take up to 10 days.