[jempol]

hello,

I have a lot of this MAPIMailbox error message in event viewer

MAPIMailbox::MAPIRecipstoRIMRecips - QueryRows (0x80004005) failed

Is it something that I have to worry about?

because I have several users that is mailbox agent ID can't restart and had hard time to activate some users

[Adramalech]

Hi

Just a guess, but did you try to move the mailbox to a fresh database within exchange. Over time, Exchange DBs tend to get more and more inconsistencies depending on what is being done on exchange or especially if the DBs grow a lot.

Are you familiar with i.e. Eseutil? Here's a nice article to it: Exchange Server Database Utility Guide
The downside of this is that you have to take the store in question down - the workaround is the above mentioned method of moving mailboxes to fresh stores/storage groups.