My emails are being deleted from my inbox once opened.

Blackberry 9360.

When I open my emails on my blackberry they disappear from my inbox as well as from my POP3 (squirrel mail) inbox. There is not an option to be found for leaving a copy of the emails on servers, but this never has poised a problem, because I didn't have this problem before and was using the same POP3 provider. Is there an option somewhere that could help me with my problem.

Im gonna try to solve the problem by updating the os. Not sure that its gonna do any good.

Also check your email settings on the phone in Options.