If I do a software or factor reset on the 7610 do all the standard applications have to be reinstalled? I remember that this was the case with the 9210 and the install CDROM for the phone include .SIS files for the standard apps. I don't see any .SIS files for the 7610 on the CDROM so I'm a bit concerned that if I do a reset I'll lose everything. Does anyone know?

Also, my 7610 doesn't have the 'presence' applications installed. I assume my operator doesn't support this functionality. Is it still possible to use services like yamigo? If so, how do I get these applications installed on the phone?

Chris.
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http://radio.weblogs.com/0102385

All the original, built-in applications will remain (they're in ROM & a reformat will not affect them, just their settings and other data they might have stored on the C-drive).

If your operator variant has the Presence/Chat/Positioning apps removed, the only way to get them is to have a Nokia service center flash the phone with a "generic" firmware release instead. As far as I'm aware, they're not available as user-installable .sis files.

If Opera came with your phone, this will be on your MMC, so don't format that or you will loose it.