Owa and Outlook 2010 search incomplete

hi all,

i have a problem with outlook 2010 and owa in exchange 2010 SP2 (not rollup installed) when i do search item.

Outlook 2010 Small business basic is installed in Terminal Server 2008 R2 Enterprise.

I have not cache mode enabled and search item worked  fine without problems.

Now search appair incomplete; when i try to search mail the filter seeam to found only last mail (last moth) and old mail.

All item in period from may 2012 to september 2012 are missing in search result also if matching filter criteria.

Any idea?

Thanks in advance for your support.

Cristian