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If a user is removed from a company, the user will no longer have access to the company, or be listed in the list of users inside the respective company.
Send mail with documents for approval
You can choose whether the user should receive emails with documents for approval.
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This feature is set by default when a new user is created.
Out of Office
You can see in the user overview which users are "Out of office" by clicking on "Out of Office"
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Set user Out of Office
Select the user you want to put Out of Office and click on the orange "Out of Office" button.
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This opens a window where you can set the user Out of Office.
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See the section Out of Office in User Profile.