Migration Tool does not populate Mailboxes On-Prem Free Exchange Add-on for Office 365 Migration › FORUMS › Support › Migration Tool does not populate Mailboxes On-Prem Tagged: Mailboxes On-Prem This topic has 0 replies, 1 voice, and was last updated 7 years, 11 months ago by nfoster@ces-us.net. Viewing 1 post (of 1 total) Author Posts October 17, 2016 at 12:55 pm #471 nfoster@ces-us.netParticipant When I click on the Mailboxes On-Prem tab none of my mailboxes populate. I have followed all the instructions to config this tool. Please advise, Niles Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In