diff --git a/app_new/outlook/models.py b/app_new/outlook/models.py
index 45bdda9..1dd5e79 100644
--- a/app_new/outlook/models.py
+++ b/app_new/outlook/models.py
@@ -95,7 +95,7 @@ class OutlookAttachment(db.Model):
     __tablename__ = "outlook_attachments"
     
     id = db.Column(db.String(100), primary_key=True)  # Attachment ID from Microsoft
-    mail_id = db.Column(db.String(100), db.ForeignKey("outlook_mails.id"), nullable=False)
+    mail_id = db.Column(db.String(500), db.ForeignKey("outlook_mails.id"), nullable=False)
     name = db.Column(db.String(500), nullable=False)
     content_type = db.Column(db.String(100), nullable=True)
     size = db.Column(db.Integer, default=0)
@@ -112,7 +112,7 @@ class OutlookMailInterpretation(db.Model):
     __tablename__ = "outlook_mail_interpretations"
     
     id = db.Column(db.Integer, primary_key=True)
-    mail_id = db.Column(db.String(100), db.ForeignKey("outlook_mails.id"), nullable=False)
+    mail_id = db.Column(db.String(500), db.ForeignKey("outlook_mails.id"), nullable=False)
     user_id = db.Column(db.Integer, db.ForeignKey("users.id"), nullable=False)
     
     # Analyse brute (texte de l'IA)
@@ -316,4 +316,4 @@ class GmaoContext(db.Model):
 
 
 # Note: Les routes Outlook sont dans app_new/outlook/routes.py
-# Les templates sont dans app_new/outlook/templates/
\ No newline at end of file
+# Les templates sont dans app_new/outlook/templates/
diff --git a/migrations/versions/d9e3f4a5b6c7_match_outlook_mail_foreign_keys.py b/migrations/versions/d9e3f4a5b6c7_match_outlook_mail_foreign_keys.py
new file mode 100644
index 0000000..9416907
--- /dev/null
+++ b/migrations/versions/d9e3f4a5b6c7_match_outlook_mail_foreign_keys.py
@@ -0,0 +1,107 @@
+"""Match Outlook child foreign keys to the parent mail identifier.
+
+Revision ID: d9e3f4a5b6c7
+Revises: c8d2e3f4a5b6
+Create Date: 2026-08-14
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "d9e3f4a5b6c7"
+down_revision = "c8d2e3f4a5b6"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.drop_constraint(
+        "outlook_attachments_ibfk_1", "outlook_attachments", type_="foreignkey"
+    )
+    op.drop_constraint(
+        "outlook_mail_interpretations_ibfk_1",
+        "outlook_mail_interpretations",
+        type_="foreignkey",
+    )
+    op.alter_column(
+        "outlook_mails",
+        "id",
+        existing_type=sa.String(length=100),
+        type_=sa.String(length=500),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "outlook_attachments",
+        "mail_id",
+        existing_type=sa.String(length=100),
+        type_=sa.String(length=500),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "outlook_mail_interpretations",
+        "mail_id",
+        existing_type=sa.String(length=100),
+        type_=sa.String(length=500),
+        existing_nullable=False,
+    )
+    op.create_foreign_key(
+        "outlook_attachments_ibfk_1",
+        "outlook_attachments",
+        "outlook_mails",
+        ["mail_id"],
+        ["id"],
+    )
+    op.create_foreign_key(
+        "outlook_mail_interpretations_ibfk_1",
+        "outlook_mail_interpretations",
+        "outlook_mails",
+        ["mail_id"],
+        ["id"],
+    )
+
+
+def downgrade():
+    op.drop_constraint(
+        "outlook_mail_interpretations_ibfk_1",
+        "outlook_mail_interpretations",
+        type_="foreignkey",
+    )
+    op.drop_constraint(
+        "outlook_attachments_ibfk_1", "outlook_attachments", type_="foreignkey"
+    )
+    op.alter_column(
+        "outlook_mail_interpretations",
+        "mail_id",
+        existing_type=sa.String(length=500),
+        type_=sa.String(length=100),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "outlook_attachments",
+        "mail_id",
+        existing_type=sa.String(length=500),
+        type_=sa.String(length=100),
+        existing_nullable=False,
+    )
+    op.alter_column(
+        "outlook_mails",
+        "id",
+        existing_type=sa.String(length=500),
+        type_=sa.String(length=100),
+        existing_nullable=False,
+    )
+    op.create_foreign_key(
+        "outlook_mail_interpretations_ibfk_1",
+        "outlook_mail_interpretations",
+        "outlook_mails",
+        ["mail_id"],
+        ["id"],
+    )
+    op.create_foreign_key(
+        "outlook_attachments_ibfk_1",
+        "outlook_attachments",
+        "outlook_mails",
+        ["mail_id"],
+        ["id"],
+    )