It may seem difficult to believe but Microsoft is about to turn 40.

Saturday will mark the 40th anniversary of when Bill Gates and Paul Allen founded the software giant in 1975. To commemorate the occasion, Gates sent out a letter to employees Friday, in which he reflected on the company's past and future.

The letter was sent Friday morning according to Twitter user Amit Roy Choudhary, who posted the full text of the note.

In the letter, Gates praises CEO Satya Nadella, who he credits with making Microsoft "better positioned than ever to lead" as technology continues to advance. Gates also calls out Cortana, Skype Translator, and HoloLens as "a few of the many innovations that are on the way" under Nadella's leadership.

You can read the full text of the letter below.