the nokia pc suite (not Ovi suite) has a component called video manager which converts any video files (i think) to mp4 format, it has a simple conversion interface and is optimized for n97. you will have to download it from the nokia website.

Video manager in Ovi suite does not support rmvb.

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Added on July 23, 2009, 2:28 pm

Yes, I want to convert rmvb to mp4, gzero. I have tried to copy rmvb file to the phone directly and play it but errors appears. Yes, sos strange that the phone has real player but can't support rmvb. Sigh

Hey Blinky,  I have choosen that option and it works! Thanks. The only problem I notice is the quality for the tvb series I converted from rmvb to mp4 is low (can see pixel and bit blur) where else those movies (e.g ice age) is much better. Clear. Strange. I have compared few times and result between the series and movies are the same as above.