Patent ID: 8719238

Claim:
An office-based computer system, comprising: a local network; a check-in computer application configured to execute over the local network and prompt a user of the office-based computer system to check in; a check-in database accessible on the local network and configured to store information identifying checked-in users, wherein the check-in computer application is configured to update the check-in database as users check in; an email system available for use by users on the office-based computer system without regard to whether the user is checked in; and a filtering application, integrated with the email system for use with email inboxes of the email system and in communication with the check-in database, configured to respond to an email message that is designated as an office notification message and that designates an expiration time and a recipient group by filtering out users who are not checked in from the recipients in the recipient group for the office notification message, wherein the office notification message is delivered by the email system to the email inboxes of the recipients remaining on the message as well as to the email inboxes of the recipients of the recipient group who check in after said email message was sent but before the expiration time.