Hi, We have some users which are experiancing mail reciving delay from internal users. To clarify the problem we are faceing right now for example: A recipient "Y" recived a mail at 1:00PM from sender "X"; after 10 min recipient "Y" recives mail from sender "Z" which is sent 12:50 PM before 20 min. The time delay is too big and visible. We have used message tracking to get the problem; it shows all emails are delivered to the recipient mailbox without any delay, but the emails are not visible for the MAPI clients for quite long time. Insted theMAPI client recives other emails. We have 2 Exchange 2010 hub/cas and 2Exchange 2010 mailbox servers. ANY IDEAS PLEASE HELP!!!!!!!

can you verify this delay using webmail, is webmail also exhibiting same delay?Regards Herbert Zimbizi

Only MAPI clients are experiancing the delay. Regards,

Are they running "on-line mode" or cached mode? Have you recreated the OST ? Have you looked at the Authentication Type used. Is it set too "Kerberos" ? You may even to investigate if all users are affected or certain users Are all the users on the same database or server. You may even want to change connection to use http first then tcpip do you have load balancer in the environment? Regards Herbert Zimbizi

Hi Herbert, Look what we have; All the users are running on cached mode, Negotiate Auth and i have also recreated the OST file but no luck.... All Mailbox's are found on two DAG load balance servers. Also HUB/CAS server are loadbalace between two servers. The problem is seen on some users but the number of affected users are growing up. I am currently thinking update rollup 3 for Exch server 2010 sp1 may solve my problem. Please advise! Thanks

hi, It seems it is a cilent issue. My suggestion is disable all firewall and anti-virus software and try again. Have you try to use outlook safe mode and online mode. See if the issue still occur. I find update to RU3 maybe can solve the problem, so you should try it too. hope can help you thanks, CastinLu TechNet Community Support

Only MAPI clients are experiancing the delay. Regards, Hi, I have seem the same problem a lot when users having additional mailboxes added in Outlook. It that is the case, then I suggest that you turn download Shared Folders off. To disable the caching of all shared folders, follow these steps: On the File tab, click Account Settings in the Account Settingslist. In the Account Settings dialog box, click the E-mailtab and then double-click your Microsoft Exchange Server account. In the Change Account dialog box, click More Settings.In the Microsoft Exchange dialog box, click the Advanced tab.Click to clear the Download shared folders check box. Martina Miskovic

hi, How about your issue now, any update? If the solution that above say can fix your issue, please remember to mark as answer. hope can help you thanks,CastinLu TechNet Community Support

I was expecting RU3 may solve this issue but no luck. the problem still exists, some email are not visible on MAPI clients but you can see them on OWA. BR/

hi, i also getting the same issue. running with exchange 2010 sp1. Just enable the DAG, one week ago. but the issue reported only before 3 days ago. on webmail we can see the mails, but not receiving to outlook. there is a delay. mails receiving to outlook as set of mails time to time. when i restart the both the CAS/HUB servers (running on CAS Array with Windows NLB) issue is getting sorted-out for a few hours. pls. advice.