Setting notifications is a great way to stay connected. Set notifications so you can stay up-to-date on your conversations and never miss an important update.
Set notifications
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Select the Settings icon, and then select Edit Settings.
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Select the Notifications tab.
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Under Email me when, select when you want to receive email on new activity.
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Select the Groups that you want to receive an email about, when there’s new activity in that group.
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Select Save.
Source: Microsoft