I can confirm that assined policy is correct for desired mailbox.
May be I should check something else?

Hello goolka,

Run an archiving task that runs for these departing users in report mode (on the task rightclick, Run Now, choose report, either choose all, or choose a user you know has the policu applied)

When done, check the report to see what values it gives you. you might have ' forgotten'  to allow archiving of deleted items, calendar items etc.

Gertjan

We got round this one but having a high priorty policy which only targets a active directory group called deleted users

as soon as a user goes into this policy they are automatically enabled if they haven't already been and everything including tasks and calendar and contacts are extracted without creating shortcuts

I am totally surprised.
I can see in report the following:

Which means that their inactivity limit has not been reached. It looks weird for me as all items older than 1 day should be archived.

Have you selected all the message classes on the Exchange Mailbox policy for this group?

Have you checked the "Archive unread items" within the archiving policy -> Archiving Actions?
What is the modified date, if you open the user's mailbox?

Thanks to all!!!

Eventually I did realized that mailboxes have not been archived only if they were in the another Provisioning group (some of our support staff fogot to remove them from security group).
So first advice was right.

Thanks to all for your help!