Office2 HD, one of the leading iPad apps for working with Microsoft Office and other document types, got an update yesterday – to Version 5.1.

One of the biggest new features in this update is the ability to track text changes in documents. This one should be a big selling point for a lot of power users and users who collaborate often on documents.

Here are some of the other notable new features in this new version:

• XLSX support
• PPTX support
• Support for track text changes in documents
• Support for comments in documents
• Microsoft SkyDrive support
• Egnyte cloud support
• Soonr cloud support

One of my favorite existing features of this app is that it lets you work with files from both Dropbox and Google Drive. It’s a very good all-round document handling app.

Here’s an App Store link for Office2 HD; it’s priced at $7.99.