I can use my 50mm f/1.8 from 1974 on any 4/3 or m4/3 camera with adapters supplied from Olympus. Likewise, 4/3 lenses can be used on m4/3 cameras, also with an adapter built and supplied by Olympus. Is there any indication whatsoever that they will not support their users in the future?
Now, try a Nikon AF D lens on a D3100 (no, it won't autofocus), or a Nikon AIS lens on the same camera (sorry, won't even meter). Or a Canon FD lens on an EOS camera (sorry, won't mount, no adapter possible).
Olympus takes great care of their users. No need to worry.
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Jorgen, my name is Jorgen
the Nikon F mount has far less compatibility problems than you make out in your post, you say how a 50mm/1.8 can be used with an adaptor on a 4/3rds body but fail to mention it needs to be manually stopped down and focused manually, yet a Nikon AF D lens on one certain body needs to manually focussed.....with out an adaptor
The Nikkor 50/1.8 is a current autofocus lens from Nikon, still it lacks important functionality, namely AF, with Nikon's best selling camera bodies. The Zuiko 50/1.8 was introduced 40 years ago, before AF was even invented, and was discontinued 10-20 years ago. Still Olympus makes converters for this and all other OM lenses. Nikkors from before 1977 can't even be mounted on current bodies without being modified.
Remember when the E-510 was introduced, and didn't support IS on legacy lenses? As soon as Olympus understood that this was an issue for many people, they upgraded their firmware, even if it didn't mean a single extra lens sale for them.
Apart from Pentax, it's hard to find a camera manufacturer with a better support for legacy glass. And btw., I'm a Nikon user, with four F-mount bodies and countless lenses.
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Jorgen, my name is Jorgen-