Apple (AAPL) has legions of rabid fans, and their devotion is very strong.

A new survey by Mizuho Securities finds that 95% of people who use only Macs say their next purchase will be another Mac. That's not too surprising, as these people were already diehard Mac fans.

But Mizuho also interviewed people who own both Mac and Windows computers. Of that group, 70% said their next computer would be another Mac. Barron's reported the Mizuho survey Monday.

Mizuho analyst Abhey Lamba thinks people are waiting on Windows computer purchases until they see the upcoming Windows 8 operating system. The real buying will come after April 2014, when Microsoft (MSFT) ends support for Windows XP. (Microsoft owns and publishes Top Stocks, an MSN Money site.)

Mizuho also interviewed tablet and smartphone owners. Those responses likely contributed to Lamba's decision to raise his iPad sales estimates to 15.93 million for the second quarter and 20.71 million for the third quarter, up from 15.22 million and 19.02 million, Barron's reports.

Lamba cut his iPhone estimates to 27.18 million for the second quarter and 25.82 million for the third quarter, from 32.44 million and 28.55 million. IPhone purchases will slow as people wait for the new one to come out this fall, he said. But he raised its iPhone sales estimate for the fourth quarter to 51 million from 41 million.

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