This week subscribers to Google's Gmail invitation only service discovered that they had 50 invitations to Gmail that they can pass on to friends and acquaintances. Gmail is already a hot ticket even with its exclusive setup, the service offers one gigabyte of free storage space. TheStreet reports the service currently in test mode only offered half-dozen invitations at a time to Gmail users before. Some believe this move could mean Google is getting ready for a public rollout of Gmail -- a development that would heighten Google's competition for usage and advertising dollars with Yahoo! and Microsoft's both of which offer free Web-based email services as well. A spokesman for Google confirmed the increase but stopped short of saying Google is reading to bring Gmail to the masses. Since Gmail debuted, Yahoo! has raised its storage capacity on free accounts to 250 megabytes and has upped storage capacity on paid email accounts to 2 gigabytes. In other Yahoo! news the company introduced a Test version of a new Internet search tool that allows users to dig more deeply into selected topics without leaving the Web pages they're reading. Computerworld reports the new product, YQ, also would allow Web site operators to integrate related search results directly into their own sites and could one day compete with Google Inc.'s advertising program for Web site operators, one analyst said. In Microsoft News the Software Giant launched Internet search engine will now permanently replace the Yahoo search technology that has been used on Microsoft's MSN website.