Hold the train. Just as news was starting to spread that Microsoft was about to release XP Service Pack 3, comes word of yet another delay. According to CNet’s News.com:

The software maker said there is a "compatibility issue" between the XP service pack and Microsoft Dynamics Retail Management System, a retail chain management program for small and midsize businesses.

Microsoft finalized the code for Windows XP SP3 last week and had planned to make it broadly available starting Tuesday.

"In order to make sure customers have the best possible experience, we have decided to delay releasing Windows XP SP3 to Windows Update and Microsoft Download Center," the company said in a statement.

The glitch also exists between Microsoft Dynamics RMS and Windows Vista Service Pack 1, though that product has already been broadly released. Microsoft started pushing out Vista SP1 last week via Automatic Updates.