diff --git a/xlsx/src/import/worksheets.rs b/xlsx/src/import/worksheets.rs
index f3e0bd9..cb946f0 100644
--- a/xlsx/src/import/worksheets.rs
+++ b/xlsx/src/import/worksheets.rs
@@ -336,6 +336,7 @@ fn get_cell_from_excel(
     sheet_name: &str,
     cell_ref: &str,
     shared_strings: &mut Vec<String>,
+    rich_text_inline: Option<String>,
 ) -> Cell {
     // Possible cell types:
     // 18.18.11 ST_CellType (Cell Type)
@@ -397,12 +398,15 @@ fn get_cell_from_excel(
                 }
             }
             "inlineStr" => {
-                // Not implemented
-                println!("Invalid type (inlineStr) in {sheet_name}!{cell_ref}");
-                Cell::ErrorCell {
-                    ei: Error::NIMPL,
-                    s: cell_style,
-                }
+                let s = rich_text_inline.unwrap_or_default();
+                let si = if let Some(i) = shared_strings.iter().position(|r| r == &s) {
+                    i
+                } else {
+                    shared_strings.push(s.to_string());
+                    shared_strings.len() - 1
+                } as i32;
+
+                Cell::SharedString { si, s: cell_style }
             }
             "empty" => Cell::EmptyCell { s: cell_style },
             _ => {
@@ -480,16 +484,11 @@ fn get_cell_from_excel(
                 }
             }
             "inlineStr" => {
-                // Not implemented
-                let o = format!("{sheet_name}!{cell_ref}");
-                let m = Error::NIMPL.to_string();
-                println!("Invalid type (inlineStr) in {sheet_name}!{cell_ref}");
-                Cell::CellFormulaError {
+                // NB: This is untested, I don't know of any engine that uses inline strings in formulas
+                Cell::CellFormulaString {
                     f: formula_index,
-                    ei: Error::NIMPL,
+                    v: rich_text_inline.unwrap_or("".to_string()),
                     s: cell_style,
-                    o,
-                    m,
                 }
             }
             _ => {
@@ -796,7 +795,7 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
         // 18.3.1.4 c (Cell)
         // Child Elements:
         // * v: Cell value
-        // * is: Rich Text Inline (not used in IronCalc)
+        // * is: Rich Text Inline
         // * f: Formula
         // Attributes:
         // r: reference. A1 style
@@ -820,6 +819,26 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
                 None
             };
 
+            // <c r="A1" t="inlineStr">
+            //   <is>
+            //     <t>Hello, World!</t>
+            //   </is>
+            // </c>
+            let cell_rich_text_nodes: Vec<Node> =
+                cell.children().filter(|n| n.has_tag_name("is")).collect();
+            let cell_rich_text = if cell_rich_text_nodes.is_empty() {
+                None
+            } else {
+                let texts: Vec<String> = cell_rich_text_nodes[0]
+                    .descendants()
+                    .filter(|n| n.has_tag_name("t"))
+                    .filter_map(|n| n.text())
+                    .map(|s| s.to_string())
+                    .collect();
+
+                Some(texts.join(""))
+            };
+
             let cell_metadata = cell.attribute("cm");
 
             // type, the default type being "n" for number
@@ -976,6 +995,7 @@ pub(super) fn load_sheet<R: Read + std::io::Seek>(
                 sheet_name,
                 cell_ref,
                 shared_strings,
+                cell_rich_text,
             );
             data_row.insert(column, cell);
         }
diff --git a/xlsx/tests/openpyxl_example.xlsx b/xlsx/tests/openpyxl_example.xlsx
new file mode 100644
index 0000000..aa1609e
Binary files /dev/null and b/xlsx/tests/openpyxl_example.xlsx differ
diff --git a/xlsx/tests/test.rs b/xlsx/tests/test.rs
index f86ec91..da4bdaa 100644
--- a/xlsx/tests/test.rs
+++ b/xlsx/tests/test.rs
@@ -531,3 +531,33 @@ fn test_user_model() {
     // we can still use the model afterwards
     model.set_rows_height(0, 1, 1, 100.0).unwrap();
 }
+
+// This is produced with:
+// from openpyxl import Workbook
+
+// # Create new workbook
+// wb = Workbook()
+// ws = wb.active
+
+// # Write text and formula
+// ws['A1'] = 'Hello, World!'
+// ws['A2'] = '=1+1'
+
+// ws['B1'] = '=CONCAT("It is", " what it is")'
+
+// # Save
+// wb.save('openpyxl_example.xlsx')
+#[test]
+fn test_pyopenxl_example() {
+    let mut model = load_from_xlsx("tests/openpyxl_example.xlsx", "en", "UTC").unwrap();
+    model.evaluate();
+
+    let a1 = model.get_formatted_cell_value(0, 1, 1).unwrap();
+    assert_eq!(a1, "Hello, World!");
+
+    let a2 = model.get_formatted_cell_value(0, 2, 1).unwrap();
+    assert_eq!(a2, "2");
+
+    let b1 = model.get_formatted_cell_value(0, 1, 2).unwrap();
+    assert_eq!(b1, "It is what it is");
+}