Major Description
1) When selecting a Mailbox (a select INBOX) the count of all messages and the count of all recent messages get calculated on the fly. That
works well on small mailboxes, but as more messages you have as slower it get.
I would like to store the messageCount and recentMessageCount in the Mailbox and just update these on append/setFlags/expunge operations.
To be sure we don't get corrupted data somehow, we should create some kind of backgroundprocess which recalculate these counts every X
hours.