Microsoft and Sun Microsystems are to discuss .net and Java interoperability at the forthcoming JavaOne developer conference in the US.
Although Microsoft isn’t expected to launch any specific products to make it easier for developers to use both software development platforms, the attendance by Microsoft demonstrates the warming relationship between the competitors.
The pair settled a long-running legal dispute last year, with Microsoft shelling out $2bn (£1.08bn) to Sun Microsystems to end it.
And Microsoft and Sun recently announced they had joined up to develop a single sign-on security system for web users.
Microsoft representatives will participate in a number of technical sessions at next month’s San Francisco JavaOne show, and Microsoft has also rented a stand for the first time.
One technical session has the title of "On the Couch with Sun and Microsoft," described by the show website as the first time the companies have discussed .net and Java interoperability at the event.