Bulk username change

Dear Experts,

In AD our user logon names are firstname.surname@company.com and our Pre-Windows 2000 logon name are Company\FirstinitialSurname

We need to change all our Pre-Windows 2000 logon names to firstname.surname

What's the easiest way to do this for all users? (Hundreds of users in multiple OUs) Also what implications are there for instance on Exchange and file server folder permissions?
Bladey001Asked:
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MaheshConnect With a Mentor ArchitectCommented:
There should not be any impact as file server recognize upon SID and Exchange works on alias

you can download "Bulk AD Users" tool from Wise soft (Freeware) and search user there from list, OU or entire domain and there is option called properties to load.
There you should select Pre-Windows 2000 logon names, logon names, 1st name, last names
Then you need to export this list to Excel from tool
Then you need to use Excel concatenate function to club 1st name + last name in the format of 1st name.lastname and map them with logon names in csv file format.
Now you can pass this file as input to another option call csv update from the tool and it should update the required fields for you for all users in the list

http://wisesoft.co.uk/software/bulkadusers/default.aspx

You can try and get more help from tool web site

Mahesh
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footechCommented:
Using PowerShell and the MS AD cmdlets.
Import-Module ActiveDirectory
Get-ADUser -filter * | ForEach {
   $newsam = ("$($_.givenname).$($_.surname)").ToLower()
   Write-Output "Changing $($_.samaccountname) to $newsam"
   Set-ADUser _.samaccountname -SamAccountName $newsam -whatif
}

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Comment out or remove the Write-Output line if you don't want any feedback, and remove the -whatif parameter from Set-ADUser to run for real.  With the -whatif parameter in place, no changes will be made.

Neither Exchange or folder permissions should be affected.  Folder permissions in particular are referenced by the account's SID which doesn't change.  You may want to ask the question in the Exchange topic area for a more definitive answer regarding that, as Exchange isn't my strongest area, but I don't see it being an issue as renaming a user is a common task.
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