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Modify The Tombstone Lifetime

I would include a few PowerShell scripts here that can be used to modify the tombstone lifetime along with the deleted object lifetime. Remember that the default for both of these is going to be 180 days and will show up as Null if you use LDP to view the attributes.
PowerShell Script to change the tombstone lifetime of my domain (AdminPrep.Local) to 250 days:
Set-ADObject -Identity “CN=Directory Service,CN=Windows NT,CN=Services,CN=Configuration,DC=AdminPrep,DC=Local” –Partition “CN=Configuration,DC=AdminPrep,DC=Local” –Replace:@{“tombstoneLifetime” = 250}
PowerShell Script to change the deleted object lifetime:
Set-ADObject -Identity “CN=Directory Service,CN=Windows NT,CN=Services,CN=Configuration,DC=AdminPrep,DC=Local” –Partition “CN=Configuration,DC=AdminPrep,DC=Local” –Replace:@{“msDS-DeletedObjectLifetime” = 250}


Courtesy : LazySysAdmin
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