Greeting phrases to remember

Listed are basic phrases used daily in a workplace environment in Japan.

When arriving at the office in the morning do not forget to greet everyone with: Ohayou gozai masu. The direct translation means "good morning", however people use it as soon as they arrive for their work shift even if their shift starts later in the day.
Before going out to see clients, notify coworkers that you are leaving: Itteki masu, which means "I'm heading out". Others will reply itterashai which is a form of acknowledging that you're going out.
When you have met with your clients at a meeting, say yoroshiku onegai itashimasu which is a phrase that shows interest in collaboration. If you are in a meeting with your teammates and coworkers, use a less formal version: yoroshiku onegai shimasu.
If you are going to leave a meeting and others are still left in the room, say shitsurei itashimasu which is a way of announcing that you are excusing yourself. A less formal version for an internal meeting is: shitsurei shimasu
When you arrive back to an office after an offsite meeting, let coworkers know you have returned by saying: tadaima modori mashita (I've just returned). Your teammates will reply with okaerinasai (welcome back). A more formal reply will be okaeri nasai mase which will be used as a form of politeness to you if you are older or in a position of higher status.
When you are ready to leave the office, pay respect to those who are still working by saying: osakini shitsurei shimasu (I'm excusing myself now for the day). Then, say a final greeting to everyone with otsukare sama deshita which is a way of indicating thanks for hard work during the day.

It goes without saying that greeting politely is crucial in making good impressions, especially in Japan. As Japanese supervisors prefer to be kept in the loop of all things, these phrases will come in handy when updating and notifying your whereabouts.