Although yesterday's announcement of the Navigator-GNN deal was interpreted as a blow to Microsoft and today's announcement of the Explorer-AOL deal as a blow to Netscape, some analysts still don't think that the AOL-Microsoft alliance will necessarily do Netscape serious damage. After all, the number-two online service, CompuServe, went with Navigator on Friday. Gaining 5 million AOL users is expected to give Microsoft a boost, but Netscape's 80 percent market share will still be hard to catch up with.