Systems and methods for providing an email client interface that includes an integrated supplemental interface are provided. The supplemental interface provides access to data stored within a tabular data management system. The supplemental interface may present a form that is automatically generated based on a column layout in a sheet stored in the tabular data management system. The supplemental interface may automatically select a sheet to be opened based on information in an email message, and may automatically add information from the email message to the sheet. The tabular data management system may allow image data to be stored and displayed within cells of tabular data.