MrExcel.com

MrExcel.com, also known as Mr Excel, operates an online forum dedicated to users of Microsoft Excel. The organization is headquartered in the United States of America. Through its website, it provides a platform where individuals can ask questions, share tips, and discuss Excel-related topics. The forum serves as a resource for individuals seeking assistance with Excel.

The forum’s content is generated by its community members, who contribute solutions to common problems and advanced techniques. Participation is open to anyone interested in Excel, fostering a collaborative learning environment. Over time, the site has become a reference point for those seeking practical guidance on spreadsheet applications.

In December 2016, moderators detected a hack targeting the forum, prompting an immediate shutdown and restoration from backups. The breach exposed user IDs, email addresses, encrypted passwords stored as hash+salt combinations, and administrative metadata such as last login timestamps and post counts. After discovering that compromised credentials appeared online, the organization removed malicious code, applied patches to address platform vulnerabilities, and migrated to secure communication protocols. Affected users were required to reset their passwords and advised to update any other accounts that reused the same authentication details.