Investigation of 2 Different Oral Formulations of Estradiol and Norethisterone in Healthy Women

Inclusion Criteria: * Postmenopausal defined as at least 12 months spontaneous amenorrhoea, with serum FSH (follicle stimulating hormone) levels at least 40 IU/L and estradiol maximum 25 pg/mL. If the date of spontaneous amenorrhoea can not be identified because of previous hormone replacement therapy, serum FSH at least 40 IU/L and estradiol maximum 25 pg/mL * Non-smoking * Body Mass Index (BMI) maximum 35.0 kg/m\^2 * Able to understand, read and speak German fluently * Good state of health evidenced by medical history, physical examination including gynecological examination, and results from laboratory examination * Willing to abstain from intake of caffeine containing food and beverages within 48 hours before drug administration Exclusion Criteria: * Known or suspected allergy to trial products or related products * Previous use of oral, transdermal, nasal spray, vaginal preparations and implants within 8 weeks prior to the planned first drug administration * Known, suspected or history of breast cancer * Known or suspected estrogen dependent neoplasia e.g. endometrial cancer * Abnormal genital bleeding of unknown aetiology * Known insulin dependent as well as non-insulin dependent diabetes mellitus * Positive test for HIV (human immunodeficiency virus) and/or hepatitis B and C * Systolic blood pressure (BP) above or equal to 160 mm Hg and/or diastolic BP above or equal to 100 mm Hg, currently treated or untreated