[jenseng]

Does the trademark office just rubber stamp anything they get and let the lawyers fight it out? IANAL, but these look pretty similar:

85632326 (Instructure):

IC 042. US 100 101. G & S: Application service provider (ASP) featuring software to enable uploading, posting, showing, displaying, tagging, blogging, sharing or otherwise providing electronic media or information over the Internet or other communications network

86642511 (Canvas Labs):

IC 042. US 100 101. G & S: software as a service (SaaS) services featuring software used to allow collaboration between users for sharing information; software as a service (SaaS) services featuring software to create, structure, edit, access, integrate, manage, interpret and synchronize documents, content and data between users

[joelrunyon]

The trademark office will catch it sometimes but the onus is typically on the trademark holder to monitor & object to any trademark filings that might conflict with ones they've registered.