INBOX only showing 80 messages on one account, but 1000+ on others?

[kinesis]

Why is it my boss' email box only shows 80-90 messages in his INBOX (roundcube truncates things beyond that)

but my account's INBOX and everybody elses' INBOX shows about 1200 or so? and you can flip through pages and get to the old stuff, no truncation? he complained about this today i was wondering what the cause could be? he has a lot of folders. i know his sent mail box has 1000+ messages but his inbox only shows 80-90 and it truncates them.