diff --git a/scripts/deploy-iis-git.ps1 b/scripts/deploy-iis-git.ps1
index 82b6aeb..d739445 100644
--- a/scripts/deploy-iis-git.ps1
+++ b/scripts/deploy-iis-git.ps1
@@ -14,9 +14,9 @@
 [CmdletBinding()]
 param(
   [ValidatePattern('^[A-Za-z0-9_. -]+$')]
-  [string]$SiteName = 'PostcardMojo',
+  [string]$SiteName = 'postcardmojo.com',
   [ValidatePattern('^[A-Za-z0-9_. -]+$')]
-  [string]$AppPoolName = 'PostcardMojo',
+  [string]$AppPoolName = 'postcardmojo.com',
   [string]$DeployRoot = 'C:\inetpub\postcardmojo',
   [string]$BindingIpAddress = '192.168.1.115',
   [ValidateRange(1, 65535)]
@@ -38,6 +38,7 @@ param(
   [switch]$AllowAnyBranch,
   [switch]$AllowDirty,
   [switch]$RunMigrations,
+  [switch]$AdoptExisting,
   [switch]$SkipSmokeTest,
   [Alias('HostPreflightOnly', 'RemotePreflightOnly')]
   [switch]$PreflightOnly,
@@ -199,6 +200,7 @@ if ($ReleaseId -notmatch '^[A-Za-z0-9._-]+$') { throw 'ReleaseId contains unsupp
 if ($Rollback -and [string]::IsNullOrWhiteSpace($RollbackTo)) { throw '-Rollback requires -RollbackTo.' }
 if ((-not $Rollback) -and -not [string]::IsNullOrWhiteSpace($RollbackTo)) { throw '-RollbackTo requires -Rollback.' }
 if ($RunMigrations -and $Rollback) { throw '-RunMigrations is not valid during rollback.' }
+if ($AdoptExisting -and $Rollback) { throw '-AdoptExisting is not valid during rollback.' }
 if (($PreflightOnly -or $LocalPreflightOnly) -and $Rollback) {
   throw 'Preflight modes cannot be combined with -Rollback.'
 }
@@ -257,6 +259,7 @@ try {
     Add-RemoteArgument $remoteArguments '-ExpectedSha256' $sha256
   }
   if ($RunMigrations) { $remoteArguments.Add('-RunMigrations') }
+  if ($AdoptExisting) { $remoteArguments.Add('-AdoptExisting') }
   if ($SkipSmokeTest) { $remoteArguments.Add('-SkipSmokeTest') }
 
   $remoteScript = $remoteArguments -join ' '
diff --git a/scripts/install-iis-release.ps1 b/scripts/install-iis-release.ps1
index e754b31..bef4b5a 100644
--- a/scripts/install-iis-release.ps1
+++ b/scripts/install-iis-release.ps1
@@ -13,9 +13,9 @@
 [CmdletBinding(DefaultParameterSetName = 'Deploy')]
 param(
   [ValidatePattern('^[A-Za-z0-9_. -]+$')]
-  [string]$SiteName = 'PostcardMojo',
+  [string]$SiteName = 'postcardmojo.com',
   [ValidatePattern('^[A-Za-z0-9_. -]+$')]
-  [string]$AppPoolName = 'PostcardMojo',
+  [string]$AppPoolName = 'postcardmojo.com',
   [string]$DeployRoot = 'C:\inetpub\postcardmojo',
   [string]$BindingIpAddress = '192.168.1.115',
   [ValidateRange(1, 65535)]
@@ -39,6 +39,7 @@ param(
   [string]$ExpectedSha256 = '',
   [switch]$RunMigrations,
   [switch]$SkipSmokeTest,
+  [switch]$AdoptExisting,
   [switch]$PreflightOnly,
   [switch]$DryRun
 )
@@ -204,14 +205,19 @@ function Get-TargetState {
   }
   $physicalPath = Get-NormalizedPath $site.physicalPath
   $releasesRoot = Join-Path $DeployRoot 'releases'
-  if (-not (Test-PathUnderRoot -Path $physicalPath -Root $releasesRoot) -or
-      -not $physicalPath.EndsWith('\public', [StringComparison]::OrdinalIgnoreCase)) {
-    throw "Existing target physicalPath is outside this pipeline's release public directories: $physicalPath"
+  $managedPath = (Test-PathUnderRoot -Path $physicalPath -Root $releasesRoot) -and
+    $physicalPath.EndsWith('\public', [StringComparison]::OrdinalIgnoreCase)
+  if (-not $managedPath -and -not $AdoptExisting) {
+    throw "Existing target physicalPath is outside this pipeline's release public directories: $physicalPath. Pass -AdoptExisting for a one-time adoption of this site."
   }
   if (-not (Test-Path -LiteralPath $physicalPath -PathType Container)) {
     throw "Existing target physicalPath does not exist: $physicalPath"
   }
-  Assert-ReleaseLayout -ReleasePath (Split-Path -Parent $physicalPath)
+  if ($managedPath) {
+    Assert-ReleaseLayout -ReleasePath (Split-Path -Parent $physicalPath)
+  } else {
+    Write-Warning "Adopting existing site at unmanaged path $physicalPath; its first release will be switched in by this deployment."
+  }
   $parentPaths = (Get-WebConfigurationProperty -PSPath 'MACHINE/WEBROOT/APPHOST' -Location $SiteName -Filter 'system.webServer/asp' -Name 'enableParentPaths').Value
   return [pscustomobject]@{
     Exists = $true; Site = $site; PhysicalPath = $physicalPath; ParentPaths = [bool]$parentPaths
@@ -292,6 +298,7 @@ if ($env:OS -ne 'Windows_NT') { throw 'This script must run on Windows.' }
 Assert-Administrator
 Import-Module WebAdministration -ErrorAction Stop
 Assert-DeploymentInputs
+if ($AdoptExisting -and $PSCmdlet.ParameterSetName -eq 'Rollback') { throw '-AdoptExisting is not valid during rollback.' }
 $DeployRoot = Get-NormalizedPath $DeployRoot
 Assert-DeployRoot -Path $DeployRoot
 if (-not [string]::IsNullOrWhiteSpace($InitialWebConfigPath)) {