Exchange E-mail Addresses and the Outlook Address Cache – Simple Talk

Because Exchange auto-complete cache uses X.500 addresses for e-mail sent to addresses within the Exchange organization, it will bounce back messages from a re-created mailbox even after you give the user account all the old SMTP addresses. This is because the old X.500 address in the auto-complete cache is missing, and this causes Exchange to reject the messages. Ben Lye explains how to solve this common problem.

Source : Exchange E-mail Addresses and the Outlook Address Cache – Simple Talk

Step-By-Step: Changing The UPN Suffix For An Entire Domain Via PowerShell – CANITPRO

Import-Module ActiveDirectory$oldSuffix = « canitpro.local »$newSuffix = « rebeladmin.com »$ou = « DC=canitpro,DC=local »$server = « DCM1″Get-ADUser -SearchBase $ou -filter * | ForEach-Object {$newUpn = $_.UserPrincipalName.Replace($oldSuffix,$newSuffix)$_ | Set-ADUser -server $server -UserPrincipalName $newUpn}

Source : Step-By-Step: Changing The UPN Suffix For An Entire Domain Via PowerShell – CANITPRO