Voicemails have been around in one form or another since the beginning telephone communications. This feature still manages to make its way on every smartphone, despite the rate in which technology is evolving. The reason for this is usefulness – you won’t miss any unanswered calls even if your phone is off. The voice messages from your callers will be transferred to your voicemail box and you’ll be able to listen to them at a later date.
In Microsoft 365, you can record a greeting, edit call answering rules, set up Outlook Voice Access, edit text message and email notification settings, and turn on voice mail preview using Outlook on the web.

From the Skype for Business desktop app (if you are running Click-2-Run build C2R 8201.1002 or later), select Set Up Voice Mail. Change your Call Answering Rules You can change what options your callers have when they reach the voicemail service; get disconnected, hear your greeting, record a message, choose to be transferred to the number or user you select. Change your prompt language This is the prompt language that is played to callers. For list of supported languages, see Languages for voicemail greetings and messages from Skype for Business. Configure your Out of Office greeting This is the customized greeting message that is played to callers when your status is Out of Office. This option can be activated "Always," when you have an active "Auto Reply" in Outlook, or whenever you have an out-of-office calendar appointment.  Where you can get your voicemail messages from
When it comes to making phone calls, nothing can leave one more in the dark than leaving a message on a voice mailbox that hasn’t been set up yet. However, if you happen to be in the dark in regards to setting up your voicemail, we’re going to walk you through the process to avoid confusion on your end. With this being said, here’s a look at how to set up your iPhone voicemail.