Windows 7 Application Compatibility is a hot topic and will only get hotter as the next MS Operating System gets ever closer. Will there be the same issues as with Pre-SP1 Vista?
Microsoft have stated that the vast majority of apps that currently work on Vista will work with Windows 7 too, however it won’t (and couldn’t be expected to be) 100%. It an effort to head off any potential problems at the pass Microsoft have released the “Windows Application Quality Cookbook” which contains a list of the aspects most likely to cause problems for developers.
Internet Explorer 8—User Agent String
Internet Explorer 8—Data Execution Protection/NX
Removal of Windows Mail
Microsoft Message Queuing (MSMQ)—Removal of Windows 2000 Client Support Service
Compatibility — Operating System Versioning
Server Core — WoW64 Is Now an Optional Feature
User Interface—Enhanced Taskbar
Microsoft Message Queuing (MSMQ)—Improved Queue Handling
Windows Server — Terminal Services
User Interface — High DPI Awareness
Removal of WPDUSB.SYS Driver for Windows Portable Devices
Server — Hyper-V
Server — 64-Bit Only
File Library Replaces Document Folder
Microsoft Message Queuing (MSMQ)—SHA-2 Is the Default Encryption Algorithm
User Interface—User Access Control Dialog Updates
I got this from Mary Jo Foley over at All About Microsoft.