diff --git a/pgloader.asd b/pgloader.asd
index 6047e3e..80ca1c1 100644
--- a/pgloader.asd
+++ b/pgloader.asd
@@ -31,7 +31,7 @@
 		 #:trivial-backtrace  	; For --debug cli usage
                  #:cl-markdown          ; To produce the website
                  #:metabang-bind        ; the bind macro
-                 ;#:cl-mssql             ; M$ SQL connectivity
+                 #:mssql                ; M$ SQL connectivity
 		 )
     :components
     ((:module "src"
diff --git a/src/package.lisp b/src/package.lisp
index f3e461e..b4ae4e7 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -291,6 +291,31 @@
 	   #:copy-database
 	   #:list-tables))
 
+(defpackage #:pgloader.mssql
+  (:use #:cl
+        #:pgloader.params #:pgloader.utils
+        #:pgloader.sources #:pgloader.queue)
+  (:import-from #:pgloader.transforms #:precision #:scale)
+  (:import-from #:pgloader.pgsql
+		#:with-pgsql-transaction
+		#:pgsql-execute
+		#:pgsql-execute-with-timing
+		#:apply-identifier-case
+		#:create-tables
+                #:truncate-tables
+		#:format-pgsql-column
+		#:make-pgsql-index
+		#:index-table-name
+		#:format-pgsql-create-index
+		#:create-indexes-in-kernel)
+  (:export #:copy-mssql
+           #:*mssql-default-cast-rules*
+	   #:map-rows
+	   #:copy-to
+	   #:copy-from
+	   #:copy-database
+	   #:list-tables))
+
 (defpackage #:pgloader.syslog
   (:use #:cl #:pgloader.params #:pgloader.utils)
   (:import-from #:pgloader.pgsql
diff --git a/src/sources/mssql.lisp b/src/sources/mssql.lisp
new file mode 100644
index 0000000..75620de
--- /dev/null
+++ b/src/sources/mssql.lisp
@@ -0,0 +1,109 @@
+;;;
+;;; Tools to handle the MS SQL Database
+;;;
+
+(in-package :pgloader.mssql)
+
+(defvar *mssql-db* nil
+  "The MS SQL database connection handler.")
+
+
+;;;
+;;; Specific implementation of schema migration, see the API in
+;;; src/pgsql/schema.lisp
+;;;
+(defstruct (mssql-column
+	     (:constructor make-mssql-column
+			   (schema table-name name type default nullable
+                                   character-maximum-length
+                                   numeric-precision
+                                   numeric-precision-radix
+                                   numeric-scale
+                                   datetime-precision
+                                   character-set-name
+                                   collation-name)))
+  schema table-name name type default nullable
+  character-maximum-length
+  numeric-precision numeric-precision-radix numeric-scale
+  datetime-precision
+  character-set-name collation-name)
+
+
+;;;
+;;; Those functions are to be called from withing an already established
+;;; MS SQL Connection.
+;;;
+;;; Tools to get MS SQL table and columns definitions and transform them to
+;;; PostgreSQL CREATE TABLE statements, and run those.
+;;;
+
+(defvar *table-type* '((:table . "BASE TABLE")
+		       (:view  . "VIEW"))
+  "Associate internal table type symbol with what's found in MS SQL
+  information_schema.tables.table_type column.")
+
+(defun list-all-columns (&key
+                           (dbname *my-dbname*)
+			   (table-type :table)
+			 &aux
+			   (table-type-name (cdr (assoc table-type *table-type*))))
+  (loop
+     :with result := nil
+     :for (schema table-name name type default nullable
+                  character-maximum-length
+                  numeric-precision numeric-precision-radix numeric-scale
+                  datetime-precision
+                  character-set-name collation-name)
+     :in
+     (mssql:query (format nil "
+  select c.table_schema,
+         c.table_name,
+         c.column_name,
+         c.data_type,
+         c.column_default,
+         c.is_nullable,
+         c.CHARACTER_MAXIMUM_LENGTH,
+         c.NUMERIC_PRECISION,
+         c.NUMERIC_PRECISION_RADIX,
+         c.NUMERIC_SCALE,
+         c.DATETIME_PRECISION,
+         c.CHARACTER_SET_NAME,
+         c.COLLATION_NAME
+
+    from information_schema.columns c
+         join information_schema.tables t
+              on c.table_schema = t.table_schema
+             and c.table_name = t.table_name
+
+   where     c.table_catalog = '~a'
+         and t.table_type = '~a'
+
+order by table_schema, table_name, ordinal_position"
+                          dbname
+                          table-type-name)
+                  :connection *mssql-db*)
+     :do
+     (let* ((s-entry    (assoc schema result :test 'equal))
+            (t-entry    (when s-entry
+                          (assoc table-name (cdr s-entry) :test 'equal)))
+            (column
+             (make-mssql-column
+              schema table-name name type default nullable
+              character-maximum-length
+              numeric-precision numeric-precision-radix numeric-scale
+              datetime-precision
+              character-set-name collation-name)))
+       (if s-entry
+           (if t-entry
+               (push column (cdr t-entry))
+               (push (cons table-name (list column)) (cdr s-entry)))
+           (push (cons schema (list (cons table-name (list column)))) result)))
+     :finally
+     ;; we did push, we need to reverse here
+     (return (reverse
+              (loop :for (schema . tables) :in result
+                 :collect
+                 (cons schema
+                       (reverse (loop :for (table-name . cols) :in tables
+                                   :collect (cons table-name (reverse cols))))))))))
+