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
There's no single best way to craft an after hours greeting. The most important point is that you equip your customers with what they need to know, and give them an avenue to contact you, whether that's through voicemail, email, or other channels.

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If you are ready to record your voicemail greeting, you should already have a solid script. Whether you include your mission statement, some fun personal details, or a favorite quote, making your voicemail greeting personal is a great way to set your business apart. Write down what you're going to say, but try to avoid reading it verbatim as you record, or it may start sounding robotic and rehearsed. When listening to your voicemail greetings your callers shouldn't feel like they're listening to an impersonal recording. Keep it conversational. If you need help achieving that conversational tone, check out these tips.