diff --git a/CHANGELOG.md b/CHANGELOG.md
index c519778..4267e52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -40,8 +40,9 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
   Install: `go install github.com/eslider/go-onlyoffice/cmd/office@latest`.
 - **`cmd/internal/bootstrap`** — shared env loading and client auth for `oo`
   and `office`.
-- Unit tests for preview formatters, menu/selection model, fetch mappers, and
-  key routing; integration tests under `cmd/office/fetch/` (`-tags=integration`).
+- Integration tests under `cmd/office/fetch/` and `cmd/office/preview/`
+  (`-tags=integration`) hit the live OnlyOffice API — no fixture maps or
+  httptest vendor mocks. Unit tests remain for pure UI/formatting helpers only.
 
 ### Added — library
 
diff --git a/README.md b/README.md
index cf2fa5a..69117d4 100644
--- a/README.md
+++ b/README.md
@@ -593,10 +593,10 @@ Spreadsheet files: inline CSV/JSON preview in the right pane; install
 [`vex`](https://github.com/CodeOne45/vex-tui) on `PATH` for full-screen
 xlsx/csv viewing (`v` on a file row — coming in next iteration).
 
-Integration tests for list loaders:
+Integration tests for list loaders and preview (live API only — no mocks):
 
 ```bash
-go test -tags=integration ./cmd/office/fetch/...
+go test -tags=integration ./cmd/office/fetch/... ./cmd/office/preview/...
 ```
 
 **Project / task documents (`oo`):**
diff --git a/cmd/office/fetch/fetch_integration_test.go b/cmd/office/fetch/fetch_integration_test.go
index 8177257..c282e93 100644
--- a/cmd/office/fetch/fetch_integration_test.go
+++ b/cmd/office/fetch/fetch_integration_test.go
@@ -12,34 +12,128 @@ import (
 	"github.com/eslider/go-onlyoffice/cmd/office/model"
 )
 
-func TestIntegrationListProjects(t *testing.T) {
+func skipWithoutLiveAPI(t *testing.T) {
+	t.Helper()
 	if os.Getenv("ONLYOFFICE_URL") == "" && os.Getenv("ONLYOFFICE_HOST") == "" {
 		t.Skip("ONLYOFFICE_URL not set")
 	}
-	client, err := bootstrap.NewClient(context.Background())
-	if err != nil {
-		t.Fatal(err)
+	if os.Getenv("ONLYOFFICE_USER") == "" && os.Getenv("ONLYOFFICE_NAME") == "" {
+		t.Skip("ONLYOFFICE_USER not set")
 	}
-	loader := &fetch.Loader{Client: client}
-	items, err := loader.List(context.Background(), model.SubjectProjects)
-	if err != nil {
-		t.Fatal(err)
+	if os.Getenv("ONLYOFFICE_PASS") == "" && os.Getenv("ONLYOFFICE_PASSWORD") == "" {
+		t.Skip("ONLYOFFICE_PASS not set")
 	}
-	t.Logf("projects: %d", len(items))
 }
 
-func TestIntegrationListMailInbox(t *testing.T) {
-	if os.Getenv("ONLYOFFICE_URL") == "" && os.Getenv("ONLYOFFICE_HOST") == "" {
-		t.Skip("ONLYOFFICE_URL not set")
-	}
+func liveLoader(t *testing.T) (*fetch.Loader, context.Context) {
+	t.Helper()
+	skipWithoutLiveAPI(t)
 	client, err := bootstrap.NewClient(context.Background())
 	if err != nil {
 		t.Fatal(err)
 	}
-	loader := &fetch.Loader{Client: client}
-	items, err := loader.List(context.Background(), model.SubjectMailInbox)
+	return &fetch.Loader{Client: client}, context.Background()
+}
+
+func TestIntegrationListAllSubjects(t *testing.T) {
+	loader, ctx := liveLoader(t)
+
+	cases := []struct {
+		subject model.Subject
+		skip    string
+	}{
+		{model.SubjectProjects, ""},
+		{model.SubjectTasks, ""},
+		{model.SubjectCalendars, ""},
+		{model.SubjectEvents, ""},
+		{model.SubjectContacts, ""},
+		{model.SubjectPersons, ""},
+		{model.SubjectCompanies, ""},
+		{model.SubjectOpportunities, ""},
+		{model.SubjectCases, ""},
+		{model.SubjectCRMTasks, ""},
+		{model.SubjectMailInbox, ""},
+		{model.SubjectMailSent, ""},
+		{model.SubjectMailDrafts, ""},
+		{model.SubjectMailTrash, ""},
+		{model.SubjectMailSpam, ""},
+		{model.SubjectUsers, ""},
+		{model.SubjectProjectFiles, "ONLYOFFICE_PROJECT_ID not set"},
+	}
+
+	for _, tc := range cases {
+		t.Run(string(tc.subject), func(t *testing.T) {
+			if tc.subject == model.SubjectProjectFiles {
+				if os.Getenv("ONLYOFFICE_PROJECT_ID") == "" {
+					t.Skip(tc.skip)
+				}
+			}
+			items, err := loader.List(ctx, tc.subject)
+			if err != nil {
+				t.Fatalf("List(%s): %v", tc.subject, err)
+			}
+			t.Logf("%s: %d items", tc.subject, len(items))
+			for i, it := range items {
+				if it.ID == "" {
+					t.Errorf("item[%d] missing ID: %+v", i, it)
+				}
+				if it.Title == "" {
+					t.Errorf("item[%d] missing Title: id=%s kind=%s", i, it.ID, it.Kind)
+				}
+				if it.Kind == "" {
+					t.Errorf("item[%d] missing Kind: id=%s", i, it.ID)
+				}
+			}
+		})
+	}
+}
+
+func TestIntegrationListProjectsMapsRealFields(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectProjects)
 	if err != nil {
 		t.Fatal(err)
 	}
-	t.Logf("mail messages: %d", len(items))
+	if len(items) == 0 {
+		t.Skip("no projects on instance")
+	}
+	it := items[0]
+	if it.Raw == nil {
+		t.Fatal("expected Raw payload from API")
+	}
+	detail, err := loader.Detail(ctx, it)
+	if err != nil {
+		t.Fatalf("Detail: %v", err)
+	}
+	if detail == nil {
+		t.Fatal("nil detail")
+	}
+	t.Logf("project id=%s title=%q keys=%d", it.ID, it.Title, len(detail))
+}
+
+func TestIntegrationMailInboxDetail(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectMailInbox)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("inbox empty")
+	}
+	detail, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatalf("GetMailMessage: %v", err)
+	}
+	if detail["subject"] == nil {
+		t.Fatalf("message missing subject: %+v", detail)
+	}
+}
+
+func TestIntegrationEventsDateRange(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectEvents)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("events in next 7 days: %d", len(items))
 }
diff --git a/cmd/office/fetch/map.go b/cmd/office/fetch/map.go
index 61495d4..d19bdd0 100644
--- a/cmd/office/fetch/map.go
+++ b/cmd/office/fetch/map.go
@@ -36,6 +36,9 @@ func ItemsFromMaps(rows []map[string]any, kind model.Kind, fields FieldMap) []mo
 		if title == "" {
 			title = str(row, "name")
 		}
+		if title == "" {
+			title = "(untitled)"
+		}
 		raw := row
 		out[i] = model.Item{
 			ID:       idStr(row, fields.IDKey),
diff --git a/cmd/office/fetch/map_test.go b/cmd/office/fetch/map_test.go
deleted file mode 100644
index f03d7ad..0000000
--- a/cmd/office/fetch/map_test.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package fetch_test
-
-import (
-	"testing"
-
-	"github.com/eslider/go-onlyoffice/cmd/office/fetch"
-	"github.com/eslider/go-onlyoffice/cmd/office/model"
-)
-
-func TestItemsFromMaps(t *testing.T) {
-	rows := []map[string]any{
-		{"id": float64(1), "title": "Alpha", "status": "Open"},
-		{"id": float64(2), "title": "Beta", "status": "Closed"},
-	}
-	items := fetch.ItemsFromMaps(rows, model.KindTask, fetch.TaskItemFields)
-	if len(items) != 2 {
-		t.Fatalf("len=%d", len(items))
-	}
-	if items[0].ID != "1" || items[0].Title != "Alpha" {
-		t.Fatalf("item0=%+v", items[0])
-	}
-	if items[0].Kind != model.KindTask {
-		t.Fatalf("kind=%v", items[0].Kind)
-	}
-	if items[1].Subtitle != "Closed" {
-		t.Fatalf("subtitle=%q", items[1].Subtitle)
-	}
-}
diff --git a/cmd/office/preview/entity_test.go b/cmd/office/preview/entity_test.go
deleted file mode 100644
index 9f2fb39..0000000
--- a/cmd/office/preview/entity_test.go
+++ /dev/null
@@ -1,89 +0,0 @@
-package preview_test
-
-import (
-	"strings"
-	"testing"
-
-	"github.com/eslider/go-onlyoffice/cmd/office/preview"
-)
-
-func TestContactMarkdownCompany(t *testing.T) {
-	md := preview.ContactMarkdown(map[string]any{
-		"displayName": "Acme GmbH",
-		"isCompany":   true,
-		"about":       "Widget supplier",
-	})
-	if !strings.Contains(md, "Acme GmbH") {
-		t.Fatalf("title missing: %q", md)
-	}
-	if !strings.Contains(md, "Company") {
-		t.Fatalf("type label missing: %q", md)
-	}
-	if !strings.Contains(md, "Widget supplier") {
-		t.Fatalf("about missing: %q", md)
-	}
-}
-
-func TestOpportunityMarkdown(t *testing.T) {
-	md := preview.OpportunityMarkdown(map[string]any{
-		"title":       "Big Deal",
-		"description": "Annual contract",
-		"bidValue":    float64(50000),
-		"bidCurrency": "EUR",
-	})
-	if !strings.Contains(md, "Big Deal") {
-		t.Fatalf("title missing: %q", md)
-	}
-	if !strings.Contains(md, "50000") || !strings.Contains(md, "EUR") {
-		t.Fatalf("bid missing: %q", md)
-	}
-}
-
-func TestMailMarkdown(t *testing.T) {
-	md := preview.MailMarkdown(map[string]any{
-		"subject": "Hello",
-		"from":    "Alice <alice@example.com>",
-		"body":    "<p>Hi there</p>",
-	})
-	if !strings.Contains(md, "Hello") {
-		t.Fatalf("subject missing: %q", md)
-	}
-	if !strings.Contains(md, "alice@example.com") {
-		t.Fatalf("from missing: %q", md)
-	}
-	if strings.Contains(md, "<p>") {
-		t.Fatalf("html not stripped: %q", md)
-	}
-	if !strings.Contains(md, "Hi there") {
-		t.Fatalf("body text missing: %q", md)
-	}
-}
-
-func TestEventMarkdown(t *testing.T) {
-	md := preview.EventMarkdown(map[string]any{
-		"title": "Standup",
-		"start": "2026-06-24T09:00:00",
-		"end":   "2026-06-24T09:15:00",
-	})
-	if !strings.Contains(md, "Standup") {
-		t.Fatalf("title missing: %q", md)
-	}
-	if !strings.Contains(md, "2026-06-24") {
-		t.Fatalf("dates missing: %q", md)
-	}
-}
-
-func TestTaskMarkdown(t *testing.T) {
-	md := preview.TaskMarkdown(map[string]any{
-		"title":       "Deploy",
-		"status":      "Open",
-		"deadline":    "2026-07-01",
-		"description": "Roll out v2",
-	})
-	if !strings.Contains(md, "Deploy") {
-		t.Fatalf("title missing: %q", md)
-	}
-	if !strings.Contains(md, "Open") {
-		t.Fatalf("status missing: %q", md)
-	}
-}
diff --git a/cmd/office/preview/preview_integration_test.go b/cmd/office/preview/preview_integration_test.go
new file mode 100644
index 0000000..ab1a911
--- /dev/null
+++ b/cmd/office/preview/preview_integration_test.go
@@ -0,0 +1,189 @@
+//go:build integration
+
+package preview_test
+
+import (
+	"context"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/eslider/go-onlyoffice/cmd/internal/bootstrap"
+	"github.com/eslider/go-onlyoffice/cmd/office/fetch"
+	"github.com/eslider/go-onlyoffice/cmd/office/model"
+	"github.com/eslider/go-onlyoffice/cmd/office/preview"
+)
+
+func skipWithoutLiveAPI(t *testing.T) {
+	t.Helper()
+	if os.Getenv("ONLYOFFICE_URL") == "" && os.Getenv("ONLYOFFICE_HOST") == "" {
+		t.Skip("ONLYOFFICE_URL not set")
+	}
+}
+
+func liveLoader(t *testing.T) (*fetch.Loader, context.Context) {
+	t.Helper()
+	skipWithoutLiveAPI(t)
+	client, err := bootstrap.NewClient(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	return &fetch.Loader{Client: client}, context.Background()
+}
+
+func TestIntegrationPreviewProjectFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectProjects)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("no projects")
+	}
+	raw, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	md := preview.EntityMarkdown(string(model.KindProject), raw)
+	if md == "" {
+		t.Fatal("empty markdown")
+	}
+	if !strings.Contains(md, items[0].Title) {
+		t.Fatalf("markdown missing project title %q:\n%s", items[0].Title, md)
+	}
+	rendered, err := preview.RenderMarkdown(md, 80)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if rendered == "" {
+		t.Fatal("glamour produced empty output")
+	}
+}
+
+func TestIntegrationPreviewContactFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectContacts)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("no contacts")
+	}
+	raw, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	md := preview.ContactMarkdown(raw)
+	if md == "" || !strings.Contains(md, "#") {
+		t.Fatalf("unexpected contact markdown: %q", md)
+	}
+}
+
+func TestIntegrationPreviewOpportunityFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectOpportunities)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("no opportunities")
+	}
+	raw, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	md := preview.OpportunityMarkdown(raw)
+	if !strings.Contains(md, items[0].Title) {
+		t.Fatalf("markdown missing deal title:\n%s", md)
+	}
+}
+
+func TestIntegrationPreviewMailFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectMailInbox)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("inbox empty")
+	}
+	raw, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	md := preview.MailMarkdown(raw)
+	if !strings.Contains(md, items[0].Title) {
+		t.Fatalf("markdown missing subject %q:\n%s", items[0].Title, md)
+	}
+}
+
+func TestIntegrationPreviewEventFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectEvents)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("no events in range")
+	}
+	md := preview.EventMarkdown(items[0].Raw)
+	if !strings.Contains(md, items[0].Title) {
+		t.Fatalf("markdown missing event title:\n%s", md)
+	}
+}
+
+func TestIntegrationPreviewTaskFromAPI(t *testing.T) {
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectTasks)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) == 0 {
+		t.Skip("no tasks")
+	}
+	raw, err := loader.Detail(ctx, items[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	md := preview.TaskMarkdown(raw)
+	if !strings.Contains(md, items[0].Title) {
+		t.Fatalf("markdown missing task title:\n%s", md)
+	}
+}
+
+func TestIntegrationPreviewCSVFromDownloadedFile(t *testing.T) {
+	skipWithoutLiveAPI(t)
+	if os.Getenv("ONLYOFFICE_PROJECT_ID") == "" {
+		t.Skip("ONLYOFFICE_PROJECT_ID not set")
+	}
+	loader, ctx := liveLoader(t)
+	items, err := loader.List(ctx, model.SubjectProjectFiles)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var csvItem *model.Item
+	for i := range items {
+		if strings.HasSuffix(strings.ToLower(items[i].Title), ".csv") {
+			csvItem = &items[i]
+			break
+		}
+	}
+	if csvItem == nil {
+		t.Skip("no csv file in project documents")
+	}
+	var buf strings.Builder
+	n, err := loader.Client.DownloadFile(ctx, csvItem.ID, &buf)
+	if err != nil {
+		t.Fatalf("DownloadFile: %v", err)
+	}
+	if n == 0 {
+		t.Fatal("empty download")
+	}
+	md, err := preview.CSVToMarkdownTable([]byte(buf.String()))
+	if err != nil {
+		t.Fatalf("CSVToMarkdownTable: %v", err)
+	}
+	if !strings.Contains(md, "|") {
+		t.Fatalf("expected pipe table: %q", md)
+	}
+}