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1.) Many incoming emails don't show from web mail or imap, but ".grp" file contains all missing emails.
2.) Firefox site load for client is over 8MB same page in chrome always under 2MB.
3.) Slow login, logout. (4-12 sec)
4.) Stats page (administrator) crashing Firefox.
5.) The whole site as administrator is slow.
SM16 is yet Beta it should not have been released.